2. If God doesn't exist you must highly consider life to be automatically generated in the universe. The universe is homogenous, the same events repeat everywhere, so you should have life everywhere. But I haven't found a person that doesn't believe in God that still believes in aliens, instead most of the people that believe in God also believe in the contrary solution for life as well.
I don't believe in a personified god, but I'm willing to believe in aliens. I haven't seen any, and I'd wager they're EXTREMELY far away, but I can't say with conviction whether they exist or not.
Humans have had a strong tendency (which appears to be questioned more and more recently) to believe themselves unique and special as intelligent life forms. I think that's pretty pretentious, especially considering how common malfunctioning brains are these days.