What is the word for someone who has no opinion on whether or not there is a creator.

If you aren't actively a theist, by most definitions you are "a-theist".

If the universe didn't exist, we wouldn't be here to contemplate it. (The Anthropic Principle) I do agree that Event One is fantastic, whatever it was. I suspect that someday we'll know. We're still collecting data and doing math.

the total universe is probably much bigger than we can see by several times

Almost certainly. Due to expansion, numerous objects 'disappear' from view every year. The speed of the expansion causes them to be unviewable. Which is a weird concept, but that's what appears to be happening.

Learn to live and thrive amid the confusion? Ok!

Good attitude. That's really all we can do anyway. But we are curious creatures, and we will continue to strive for understanding. I like knowing the latest thinking about such matters, even if it doesn't affect my daily life.