I would have to say that there isn't too many people living on this earth that are not influenced in some way be religion. If we think we're not, we are pretty naive. Most of us have been raised in a home where religious beliefs have been taught to us and even those who were not still likely had exposure through things the parents didn't even equate with religious beliefs. Our species comes from an ancient mindset of myth and superstition. This has been passed down to younger generations for centuries and it is impossible to know just what percentage of our beliefs come from this era of humanity. So, having said that, it is our old outdated, probably religious unconscious mindsets that have had most of the influence on our societies. It doesn't matter if you are part of a religious group or an athiest, if you want to justify doing something that is not in the best interests of society as a whole, you will find it somewhere. Hitler is a good example because he was a catholic, but also secular. He just took bits and pieces from where ever he pleased to come up with the justification of the holocaust. People will always find a way to justify their deeds.
The problem with some of the religions is their tendency to take their holy books literally. This leads to obvious problems, because these books can justify alot of violence and prejudice. We see that in those religions that read these books literally. I see "those" mindsets as a problem and yes it would be nice to see them gone. However, those who find support and comfort from religion and support tolerance of other beliefs, I say, go for it. We all need love and support in our lives where ever we can find that. The only time I have a problem with religion is when they decide I must believe what they believe and try to force, discriminate or kill in the name of their belief system. That I would like to see eliminated. Some religions just seem to have the "predisposition" to become fanatic.