To get a sense of how condescending that comes across, imagine if I turned that around by saying: "Religious people have more atheistic tendencies than they're aware of. By understanding atheism and/or science, these tendencies can be recognized."

A huge number of HNers would immediately see all the things that are wrong with this sentence: it generalized a diverse group, it alleges their world view is invalid and incomplete, and it's an obvious attempt of the speaker to redefine other people's convictions in terms that are easier to attack.