We have facts up to big bang. It (as usual with these things) gives us just more questions than actual answers to how the universe came to exist. I argue that it always did and always will.

I think this is faulty logic. How the universe came to exist is fine, and we don’t know, but that the universe “always existed” is a bit odd. You can’t have anything before space-time exists. In a sense that means yes, it “always” existed, because that’s the start of time, but in another sense it did not exist too, just time didn’t exist, if that makes sense. It obviously doesn’t really make sense because we’re unable to hold that concept in our mind, but time did come into existence.