Atheists, what do you believe is the best argument for the existence of a deity?

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I believe there is no best argument for the existence of a deity, because none of them are backed with any evidence.There is however, a type of deity which I imagined and found reasonable: The god is not an omnipotent being and he/she didn't completed creating us. Our lives is just a process to create intelligent beings, and there was no other way. And he cannot interfere this process, because he is not able to. We should not harm each other. Because when we are complete, we, as highly intelligent beings, will sorely regret that behaviors and it will be unbearable.(better than hell thing, right?) And of course god is not a supernatural being, he is strictly bound to natural laws that we haven't discovered, or have yet to discover(maybe could never discover due to our current physical setbacks). How he is formed, could be similar to evolutionary process.(which is the main problem for a deity for me. Because If we don't have any explanation to how god formed, than we need not to invent one!) That is a kind of deity I can settle with. But of course since all of these are not backed with real evidence and just my imagination, I see no reason to believe in. But you'll have to admit that its better then most of the current religions if not all...