Cool thing about this world, you can believe what you want. Seriously. No seriously.
Someone mentioned early on that god is a concept of society, cept it's pretty much every society, not just a select few. Sure the gods are different, but the stories are eerily similar. Now this isn't a point to pick a correct or winning religion in my opinion, but a chance to study all of them. Ive read to some extent everyone's good book. I also love astrology and science. To me its all connected.
I could attack atheism with facts (pretty much a modern concept, the only atheist society on record are the Atlantians of Atlantis) but man would I get attacked. Then all the atheist would believe Im some fundamental Christian (Im not) and then theyll go into all the errors of the bible (which are tons).
I could attack Christians, I could attack Muslims, Hindus, Buddhist, etc. etc. Ive studied and currently study them all. It's a non winning proposition. For instance, Buddhist could technically be consider atheist, if you study them. However Buddhism is classified as a religion.
Why most people attack others beliefs Ill never know....