Discussing athiesm today, how do I address this?

[Duke]

I saw a lot of bad replies so I stopped reading, but the point is that math is just a constructed model that we use to describe what we see. There is no governance about it. We modify our models based on what we observe in all of the sciences, and they get better over time.

Math also uses the concept of invariants, and we don't have enough information to find many invariants in the universe. If we did, then we'd be able to model a lot more of it perfectly. For instance, 1+1=2. But for a lot of things, we aren't too good at deciding what "1" even is. In most cases it works, though, so it's useful.

So, there's no belief about 1+1 being 2. It's just a way of describing that when you have a "something" and then another "something" in the same set. "2" is just a name we give to that observable quality of the universe.