I am an atheist, but only just as I was an agnostic for a long time. An agnostic likes the idea of a god, however feels that it can't be proved. but an atheist just doesn't believe, whilst a theist does. I am supposedly catholic, but I have never really been religious, as my parents never took me to church or forced me to pray. However I did go to a catholic school as my primary school where there was a mass every week and I even got my 1st holy communion done. It was only when I was asked...
might think we are all the same. Even a religion gets separated. There are over 10 different Christian sects all worshipping slightly differently. Surely God would get annoyed if they were all supposed to be worshipping one way.

Finally I want to give an example that even if God did exist, he can't do everything. If you asked God to create a boulder so large he himself could not lift it, then he can't do everything. If he can create the boulder then he can't lift it, and if he can't create it, then again he can't be almighty.