I dont...

Whatever I could think up would be wrong, hence its an exercise in futility. if I postulate that there is a fluffy land with unicorns running around in it, thats just as likely to be correct as some old father-like dude watching us from his seat in some mythical kingdom, nothingness, some weird 9-dimensional spacetime etc etc. Its all just arbitrary guesswork with no frame of reference. So you can make up whatever story you like and be content that its just as likely as whatever other story you've heard.

Maybe the Christian God did it, but then again, maybe I made it all. And seeing as how you're actually talking to me right now, then im probably more likely to have made the universe than the Christian God, because at least you have evidence that I exist.