The world looks pretty scary when we try and look at it as it really is. As much as we try to account for it, at some level we are a function of that which we observe and take in- from that viewpoint, it is not difficult to imagine a scenario where the information you take in becomes skewed along lines that don't mach up with reality. Given enough skewed data, we all make choices that appear irrational from other eyes.

Sadly, none of us rank information told us once as highly as information we "discover" for ourselves. I don't know if the conversion process works like the de-conversion process at all, or if my de-conversion was typical, but the process of moving from an indoctrinated evangelical christian to an out atheist was the work of years, of countless internal dialogues, and of long periods of confusion. In some ways, becoming an atheist meant embracing my confusion- in understanding that clear answers are very rarely present, and even more rarely easy to find. Faced with that, I think I can imagine a process that would sway an atheist mind.

What to do about it? I don't know. Religion provides a certainty, a comfort that atheism seemingly cannot- we cannot right now promise you will live forever, or even longer than the average person with any confidence. We cannot tell you your place in the world, or give you an easy guide to how to live life well. We have half answers, and bits and pieces, and we ask you to take all this uncertainty, and do the best you can with it. That's not an easy way to live life, and I can see how easy it would be to want an escape, into the arms of something more concrete.

Edit: paragraph breaks ahoy!