I’ll take a different approach for you. No matter how the universe came to exist, it’s pretty unbelievable. It’s almost impossible to fathom that the universe just came from nothing (which I believe is what you’re suggesting). But to me it’s equally unfathomable that there was just always a universe. And if you objectively think about it, it’s just as unfathomable that there is a higher power that created it all. Whatever the origin of the universe is, it’s too crazy to even comprehend. So just because it seems really wild that the Big Bang happened, any other explanation is equally as wild and bizarre. However if you’re talking about the actual big bang and not necessarily the origin of the universe, there’s mountains of scientific evidence to suggest it’s what happened, as I’m sure you can see in the other comments.