I don't believe in God because I believe in evidence. Obviously, people will argue how can a book travel round the globe and billions of people read it, but if we had a time-machine and went 1000 years into the future maybe we'll all be wizards in Potterland.
I just don't see enough evidence to convince me that science is wrong and that a bearded-man with very last century views on marriage, love and belief are right.
I don't hate on religion, I respect everyone's views. I just don't like when people say 'I just don't believe gay marriage is right' - just because God told them it wasn't. I think people should go by what they believe and not the community or family around them. I did, I'm the only Atheist in the family and happy.