Organized religion requires a level of discipline that I lack. I don't like to get dressed up for events; I don't like restrictions on diet or speech. I also don't like to believe in something just because an authority figure tells me to.
I'm not opposed to some religions and I think many people would benefit from the moral instruction taught in churches, temples, and synagogues.
As to the God question, I'm agnostic. I don't know enough to be an atheist.