Honest Question to Atheists - Best Argument?

[AtheistAspie]

Not really. Most arguments for the existence of god are circular, and predicated on the expectation that you already believe. "God exists because God exists," or more commonly, "God exists because the bible says he does, and God wrote the bible." My step-father, who is a relatively devout Christian, will occasionally attempt to persuade me to believe, but I punch holes in every argument he comes up with like paper. He's one of those who believes because it was how he was raised, not because he actually considered the matter from an objective or rational standpoint and came to the conclusion that he believed of his own accord. He has virtually no explanation for every question about religion that I ask him, even simple ones like, "If God created man in his own image, doesn't that mean he created gay people? And why would he hate them because of how he made them?"