Religion doesn't cause wars, individuals use of religion for their own means does.
I was brought up a Christian, I never attended Church until we happened to go one Christmas for the Nativity (I'd be about 33). We enjoyed it and became regular Church goers and very active in Church life. I was even elected a member of the local Parochial Church Council. As the kids got older and the old Vicar (who was a top bloke) retired we stopped going and haven't been for around three years.
I really enjoyed the Church and friends we made there but I have to consider myself a non believer.
I've seen a great deal of suffering, I've seen good people suffer horrible lives and this along with me being essentially a scientist means I cannot believe in some being out there who controls everything (unless it's Bernie Eccelstone).