I know you like to antagonize everyone but let us look at it this way.
Nearly every religion on this earth, be it with contact of people who we had through the ages, or only recently (various Tribes) all believe in a certain god. Be it one god. The rest are indicated as demi gods (Hindu religion and other Paegan religions). What I am getting at is, there is always the belief of spirituality and as well (In Hinduism and such, there is the Big guy, and then his underlings).
It is rather easy to explain. I am an hardcore Anti-Theist, i have no ideas, thoughts or believes in supernatural things other the effect of peoples die hard believes of something that can have a psychological effect on how they act in different situations that may be described as dangerous or difficult, but i know for certain that if i as a Die hard Anti-theist, will get into a seemingly hopeless or an obvious hopeless situation where my life depends on help other than myself, i will pray to any god. This is a simple psychological mechanism embedded in every human to grasp for everything to stay alive, someone who losses hope, will accept his faith and die faster and that often without trying to find solutions for his situation. Nothing divine or supernatural about it, that is how our brains work and that is a good thing, however our brains
Some brains that invent religions with absurd rules, laws that have cruel punishments deeply and fundamentally as part of a religion is also a disgusting thing but also a mechanism that exploits the psychology of us humans ie Manipulation by hope and fear.
People have faith that dark matter exists but we have not discovered it. So are scientists just as delusional then to you? We barely know what is happening in our universe. To say what is certain, is simply fooling ourselves. I am at the moment of a crisis regarding faith. I have my faith, to a certain degree. I cannot follow it blindly though. I guess the Orthodoxy belief is quite something (good), but I think Hindu's may have it right, since it is indeed the oldest and longest surviving religion.
I do not know about "people having faith" that dark matter exists, there are some theories based on some gaps in our understanding and knowledge about physics and some try to get to some theories trying to fill those gaps and Dark matter just as anti-graviton are such things. We haven't proven so far that Gravity exists by a clear defined way of physics, because there are some phenomenons that are contradicting to current and old "understanding" that gravity was direclty connected to mass, but in some phenomenons it appeared to be not the case. The difference between Science and Religion is that Religion has installed unchangable parameters, rules and laws. God is divine, there are no other gods beside him, heaven and hell, 10 commandments, God is, invisible, you have to believe in him, he works in mysterious ways, god was his son and gave his life for all sinners, bla bla bla. Religion does not try to achieve goals like answering questions. Every question of believers are always answered, that their lack of faith is a problem and untill they are not believing more, they will not "see" or "solve" their problem. Science tries to clearify by empirical studies to understand physical Laws and is not proposing one System, Concept or "Scientifical fact" for the rest of all time as the Dogmatic unchangable rule.
We don't even know who we are as a species and we have no real idea other than hypothesis as to our origins.
We are the only species we know that has such a potent brains with such a complex psychology and we have no means to measure our "believes, knowledge and phyolosophies of our existence" that lack of real and evident species to compare us to is a problem for our own understanding. We humans have only one ability, we compare everything and everyone to something we understand and know, we have no real intelligent means of measure. We measure time, speed and distance by comparision of each other to understand one of those three things. You can't give me any Speed values without comparing time that has past and distance that has been travelled, same with the other two.
I think that as long we do not find intelligent life in the universe we will never get a single grasp of what we are as a species that tries to dominate and transcendence without comparing us to something else with their technologies, culture and especially with their phylosophies which is to me one of the most intersting aspects of finding new alien life forms with comparable or higher intelligence.
There are of course Scientific fields that are prohibited to study, that comes usually because of interests of big companies like, public studies that are not directly involved or engaged by Energy giants or Oil companies to develop alternative products or sources of energy and Technology behind it. They pay good price to get personal owned scientists to work for them, to have technology in advance for the marketing of tomorrow, but keep it tightly closed, patented and also destroy any "freelancer" that tries to come up with such technologies, sue them or buy off their technologies and then seal it, so their current oil making buisness does not have to change to a less profitable and most importantly a source that may have no one to hold power off. Oil is controlled by cartells, wind and sun can't be controlled by cartells. That is the problem of science i have with, people sealing technologies for money or power reasons and there is a very brought spectrum of fields in science that are "banned" for broad public.
We are dead certain that the Big Bang happened, without a lick of evidence or proof of the matter. Simply put, some people believe there was nothing, then something. Others believe there was a universe before this. I myself think this universe was always here, and will always be here. And that it will keep spitting out planets and solar systems forever. Nothing will change and even if Humanity perishes, there could very well be something else. Maybe we are alone in the Universe. Maybe we are not? No evidence. No Proof, but we are fooling ourselves in pretending to be dead certain.
If i am correct, they base the Bing Bang on the fact that matters travels through the universe and all galaxies, planets and stars are moving through the universe and attracting more matter by their gravity and all have a similiar shape of revolving around each other untill they form into one object, so basically how every star, moon, planet or whatever object in space has been formed with. Meaning if matter is moving through the universe and that is evident for every star, galaxy or any other object in space that provides us with one question: "why is everything moving through space" by our knowledge and understanding nothing moves without a force applied to an object beforehand, conclusion there was a force, "One" force at once that started all that. The theory about the Big Bang is, that it can't be proven. I do not claim to understand the entire Big Bang theory, never really read actual scientific books about the Big Bang, even tho i downloaded some, never read it....anyways It can't be proven because of one thing of the former theory which lacked basic laws to be counted as a theory, the Lack of something before the Big Bang, nothing can come from nothing, so the theory today, is that before the Big Bang there must be something, energy in form of electric charge/particles, but the theory is just as flawed, however from the knowledge or the understanding there must be some force that applied energy to all mass in this universe to travel and the theory that the universe is "expanding" is one of those theories that are directly connected to the theory of Big Bang. Probably we will never find out how everything come to existence, our time as a species is very limited, not to underestimate the complexity of this question and matter. It is hard to make conclusions or studies when you lack most of the stuff like the unimagable time that has past from our understanding and our means of measurement of the universe time of the universe radiation level and dating of universe based on that very lacking technology we invented how to date time of everything.
I think we, as man, are living in a period of being overtly confident in ourselves. We think with the internet and at least the ability that we went to the moon and launched some satellites to Mars, that we know it all. But what we really know is nearly nothing and the hypothesis keep changing. And always will. Energy cannot be created nor destroyed. So what happens to our energy? Transforms. But to what? Who knows. We wont know till we die. Maybe nothing happens. Maybe it will be like sleeping for all eternity. I am OK with that too (as I wouldn't be capable of knowing any better anyway), although, I don't wish it as I would rather be able to spend eternity with my loved ones.
I aggree, we are a very arrogant species, but we lack the means of comparing our species with other species on our level (yes i see the irony in those words) with something similiar to see if that is rare, exclusive or just the sign of unmatured species.
As for dying, i can't claim to know it for dead certain (pun intented) what happens afterwards, but as described by some who have studied and seen people dying, how some have acted or were near death, it all sounds from a medical standpoint like a dying procedure and your last thoughts usually mostly uncohorent due the lack of oxygen the brain recieves, so often people interpret it as "visions or a spiritual" happening. There were also some re-appearing scences that people have described that heads of beheaded seconds after the death penalty have moved their eyeballs or tried to slowly and weakly try to form words with their lips or have looked back to the masses, which the reports often came from times of public executions. I think when we die, we are dead and nothing happens afterwards, no souls, no afterlife just what remains of us and the marks we leave on this planet and that makes me kind of said and me just like many others fear this, dying without leaving anything on earth that lasts for centuries. To achieve something as a person in life so you will be remembered for much longer time than the 100 years of your kids and grandkids life times who will remember you and after that noone will have known you, most families do not bother about their ancestors unless they have gained something to be famous to bust their own egos with the achievements of their ancestors. Hard to say but i do not thing there will be anything after this life, we make heaven and hell down here already, most are unfortune to be born in one country or in a bad family or just the circumstances of their lifes get bad, others create bad conditions and are left in a hell on earth. Some or fortune to be born in a better time, richer family, maybe in a wealthy family with morals and values which are very important in life. I think we have all here and there are no devine tests or trails to see if someone is worthy, how many were put to life just today as an infant due to disease, war, unworthy scum parents or whatever circumstances they had during their short lifes? How many have been born dead, aborted, murdered, died before they could even think for themselfs? To me that does not show any kind of form of devine plan for trail the worthy and unworthy, just a horrible place we mainly created for ourselfs actually from the sociopaths with struggle for power against the rest of population.
You want a meaning, a purpose for your life? Figure it out for yourself noone will tell you anything of value for you, you are an individual and noone knows you better than yourself, if you do not give yourself a purpose no one will do. Maybe a good start in life would be to spend your time with whatever makes you happy and try to avoid or reduce the time in your life that you could spend with things you hate, that make you feel bad that are contra to your believes, values, morals.
If you are in your old days lying to die without much things to regret, have passed on your genes, values, morals, ideas to another generation then i think you had a good life, but those are my believes.