The vast complexity of the universe, down to the delicate balance of our solar system and how that makes the earth habitable.
The anthropic principle dispels this argument with a stroke, not by explaining the mystery, but by showing how there is no mystery to be explained. It would be very odd indeed to find ourselves living on a planet on which life could not exist. Also, you seem to suffer a failure of imagination. What sorts of life might be possible in differently configured universes, solar systems, or planets? It's very arrogant and solipsistic to say that our form of life is all that is possible, or could be possible.
started at some point in the past (which implies a creator)
It does no such thing, not at all, not even in principle let alone in practice. If you allow for a god capable of creation ex nihilo then from where came the creator? If you're willing to make the admirable leap that it's capable for some things to always exist and be self-caused then reduce the complexity of your claim and just posit a self-caused and eternal precursor to the universe without a creative force. Spare yourself the experience of falling into the trap of an infinite regression.
The existence of religion throughout the ages and almost universally in every culture, even those cultures with no outside contact.
Belief in something cannot possibly be used as evidence for its existence. This is just lazy and fallacious thinking, and it's beneath you. Religion is universal in man because the human traits of wish-thinking and imagination are universal. That's why our gods are so much like us, so numerous, and yet so familiar--and why they're so concerned with our tawdry earthly affairs.