Where did the universe come from? Atheistic origin science has no answer.

[Sword of Christ]

But it's an individual thing.

I would say it's more an objective factual thing seeing as science is the tool we use understand the nature of the universe as we can observe, detect and measure and nothing else. It has nothing to say about God as it's entirely neutral and is it's own independent subject.

But there are many, many Christians out there who don't or can't or won't reconcile their particular god with science

You can say they are "dancing with unicorns".



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and they'll openly say that they reject scientific discovery for biblical tenets. How do you know they're wrong?

They're wrong because they're opening rejecting something we actually know about as a testable fact. I'm not saying God is a testable fact but a faith. It can be reasonable faith.