That’s a very loaded question and there has been writing on this topic for thousands of years. Religions have their own point of view but so do philosophers and other thinkers. I think one reason people are so willing to believe in religion (whether it’s right or wrong) is that it provides a very comforting purpose for your existence. It’s very scary and depressing to think that there is nothing other than the present and that you simply don’t…exist after you die. Not that I believe either side, like I said I don’t know, but this topic is interesting to think about.
Religion claims to have an answer but no religion has absolute proof that they are “right”. It’s called faith, belief without proof.