I answered this poll with "LessWrong has had no particular impact on my beliefs regarding religion" but that's not really true.

Reading LessWrong actually made me less antagonistic towards religion, since I didn't start reading about cognitive science and sociology until being prompted by reading LessWrong posts. Reading that stuff made me realize that there isn't some "rational little homunculus inside that is being ‘corrupted’ by all these evolved heuristics and biases layered over it" but that we are biases and heuristics; religion isn't some alien thing to be removed from the planet, but more like something that we should harness and possibly try to make healthier versions of.