Me personally, I don't care that much about religion. Religious wars are stupid, but they have absolutely zero bearing on the existence or nonexistence of a Divine Creator.
I do believe in a creator though. Mostly because, seriously...Math? Physics? That is AWESOME, and I firmly believe that there is Someone out there who needs a high-five. Are they anything remotely like a human, probably not. Could they just be a force of nature? Okay, probably. But the universe is such that life is possible, which is just mind-blowing. Maybe there's the Great and Holy RNG up there, churning all on its lonesome, the one and only divine power with its only mission to re-roll universes until it gets one containing life. Well, fine, then I think that RNG is worthy of respect of its existence, even if not worthy of worship itself.
I guess my arguments are kind of like evolutionists', really:
1) The universe is incredibly complicated, driven by a huge number of variables.
2) The conditions required for life are an incredibly narrow band, too small for chance.
3) If not by chance, then by an intelligently guided hand.
4) Therefore: A higher power must have set those initial variables.
And yes...by the Anthropic Principle, it's a given that any person in any universe would look around and say "How strange and unlikely that this universe, by chance, is perfect to allow our existence!" If it wasn't, they wouldn't exist at all. But the Anthropic Principle is only a reminder about sampling bias. It doesn't explain where it all came from in the first place.
And yeah I used to be a major theoretical astrophysics (and sci-fi) nerd, so I've heard that this universe could just be a descendant of some prior universe. But universes have to come from somewhere. Life came from a convenient mix of chemicals and probably a convenient lightning strike, that's fine, the ingredients were all there. But where the hell do you get the ingredients for a brand new universe? Until physics makes some huge new strides, my answer is going to have to be Outside, or Backstage, or *Above*. With the implication that there's some divine-level critters wherever universes come from. It makes sense that there would be one Source, and it makes the most sense if it was intelligent.
Honestly, trying to figure out the rules here is like trying to work out evolution from a single generation (single universe). It's really goddamn hard, and you don't get any hints; you just need to be really really good at quantum physics or whatever. I guess I can come up with some falsifiability here, though. If quantum mechanics proves that it's possible to kick off a big-bang just like ours, from outside of space-time, with the correct random parameters...well then, there is not a need for any Prime Mover, and I admit defeat. This is possible in my lifetime! Anything less--anything that can only be created from an existing universe, say--and God is still up in the air, the only other explanation.
Hey, crazy shit you pull out of your ass turns out to be true sometimes. Witness the cosmological constant.