I'm all for letting people believe what they want to believe, but when they choose to ignore facts, that's where I start to have a problem with religion as a whole. But, of course, this is only when it comes to those cultures that are technologically advanced. I'm not worried about what some people out in the middle of the wilderness believe because they aren't hurting anyone with their beliefs, nor are they forcing them on anyone.
However, I will conclude this by saying I'm not athiest, I consider myself agnostic. I'm willing to accept that there may be some things in religion that may be true, I just want proof. That and I don't want some random guy behind a podium telling me his interpretation of the bible (which, may be completely off the beaten path).