I don't think you can and I think it's dishonest to say you can. It really depends on the concept of god and there are many concepts. If there concept of god is just a first cause, a creative energy that started the universe, I don't think we can conclusively disprove that concept the way we can with a personal god. We can promote alternate theories, but as it stands the origin of the universe beyond the big bang is largely unknown and I'm willing to admit and recognize it. Granted, not knowing what caused the universe to exist does not automatically mean god did it, which is why I do not bother believing in a deistic god.
"The way to see by faith is to shut the eye of reason." Benjamin Franklin
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