Bob, the "first primate" question is fun, but it's a gap, not a fingerprint. Not knowing the exact first cause doesn't make a particular God real. Even if everything needs a cause, that cause could be impersonal. And Christianity didn't come before all religions, since Hinduism and Judaism predate it, so that can't settle which one is true. The pattern still holds: belief tracks culture, not one global revelation. That's okay! We can love the mystery and still ask for evidence. Sincerity is beautiful, but it isn't proof. So which god, and why?