I have to say that I find it makes since that in a apocalyptic world, but not to the extent as it is in our world as we know it. The concept of God or gods have been around since humanity lived in caves, so I don't think just because bombs sorched the land the concept of God would go away, actually in times likes that people tend to cling on the idea of a higher power more often for hope. Most Major religion in the world right now have changed very little as far as philosophy (dontrine is a different story) even under lots of persecution. Most religion have faced the trails of time, and passed.
I'm not saying that there should be a huge church in the game, but in Fallout there was a that drunk pastor, which even as a christian I thought it was pretty funny.
I'm sure this post will spark debate, which was not my intention at all.
