Religion or math - which is more concrete?

[dingdongyo]

No, his argument is that math is made up because numbers are made up. "Why do we call it TWO leaves instead of THESE leaves?" So based on that I conclude that if numbers are made up then so are letters and words.

your boyfriend is being stupid. of course they are both made up. you don't see any other animals using "two" or "these" in conversation. because we made them the eff up.
and as far as his question:
"two leaves" = .
"these leaves" = ... ? ........ ???

that's why.