Christianity or atheism:
I find most religions absolutely ridiculous and illogical, the only people who follow them are those who were brainwashed in childhood and really have no individual thought process. Most of the followers at least. Then there are theists who will twist ANY logic to fit their views. They're intelligent ones that you have to watch out for ;)
I'm not an atheist by any means, but I'd rather call myself an atheist than a Christian.
It allows for more logic in my mind.