The purpose of religion is to answer the four great existential truths:
1. Who am I?
2. Why am I here?
3. What does it all mean?
4. What is going to happen to me when I die?
As human beings, we all must face these four difficult truths about our own existence. We all must face the fact that in the grand cosmic scale of time, our life is utterly and completely insignificant and meaningless. One of our salvations in facing this bitter and terrible truth, is that it is also meaningless that it is meaningless. So every person is left with a choice. Either we choose life is meaningful, based on no rational reason. Or, we choose the dark side of nothing in life is sacred, or has any real value, and all our striving is meaningless. That is, the dark side is to be a nihilist. Most people choose some kind of mythology or religion to answer these unanswerable questions with a belief system. Many people do not like to choose having a mythology because they do not like having imaginary beliefs, that is, someone who is an atheist. And the smallest group of people just accept having the uncertainty and not trying to answer the questions at all but at the same time not being a nihilist. Each of us must choose how we are going to be. There is no evidence that exists in the Universe to help us decide one way or the other.
I am a bit of anarchist with my choice. Since most of my friends were atheists years ago, I choose to be a theist just to be different. It took me a while to stomach being an theist. But after years of arguing for theism against my atheist friends I started to believe my own arguments. Since everything on the grand cosmic scale of time is meaningless it is also meaningless that we choose to be a theist.