Religion fills a vacuum. The vacuum has to be filled. Even when people reject Christianity, they tend to pick up New Age shit, or start believing in Scientology or Eck.Right, and the same goes for other religions as well. I think it's ultimately based in the human desire to understand things, or at least to believe that one understands things.
I think fear is a major part of it. Fear of not knowing. Fear of not being in control. This fear might either be conscious or subconscious. For a theist, they fear not being in control or not knowing everything so "God" alleviates that fear by catching the theist. If something doesn't make sense well then "it is all part of God's plan"
. Don't worry too much about that because "God's way of thinking is above humans way of thinking"
. If the believer doesn't have control, doesn't know something or doesn't understand something then the believer can be secure that "God" does have control, knows everything and understands everything. I used to be a theist, I myself was comforted knowing "God" had a plan and was in control.
Of course, psychology could be a big part as well since we know that the human mind fills in or ignores the gaps in our perception, knowledge and memories. It makes connections where none should exist. The human mind does the best it can with the information it has to work with all in order to make reality more coherent because the human mind is not capable of perceiving everything, know everything and remember everything.
NOTE: I'm sure a believer will look at what I said I think here and think to themselves "look at this jerk SevenPatch, he thinks I have some kind of fear or psychological problem and he thinks he is better than theists"
Look, I'm not saying I'm better than anyone, and I'm certainly not saying atheism is better than theism. All humans have fears. I have fears, not being in control is one of those fears. I would ask any theist to be honest with themselves about the fear of not being in control and that it is comforting to know "God" is
in control. The way the human mind works is generally the same for everyone in regards to filling in the gaps of perception, knowledge and memory (including my mind).
It wasn't realizing that my fear was being alleviated by my belief in "God" that led me to atheism. It wasn't understanding human psychology that led me to atheism. I really didn't think about these things until after I realized I didn't believe in a god. No, there were many things which led me to a position of atheism.
Sorry that this was a bit off topic from the OP, but I think this thread was set up to fail from the beginning.