Reasonable atheists eventually become theists because they are reasonable; and furthermore, because they are honest. They are willing to follow the evidence wherever it leads; and in many cases the evidence comes to the atheist most coherently and well-presented through the writings of believers in God.
Author Karen Edmisten admits on her blog:
“I once thought I’d be a lifelong atheist. Then I became desperately unhappy, read up on philosophy and various religions (while assiduously avoiding Christianity), and waited for something to make sense. I was initially appalled when Christianity began to look like the sensible thing, surprised when I wanted to be baptized, and stunned that I ended up a Catholic.”

Yeah it does and is. It also is the cause of many wars.

But it also gives comfort in hard times, a social group to belong to, a way of making sense out of a crazy world, and a reason for life to many.