This is why people need to know math or have some common sense
Why do we need math or common sense? Math is the truth and common sense is what gets us out of trouble.
He was trying to convince me that there is no God.
You're implying that people who don't believe in God lack common sense. You should respect their opinion. It's wrong that you're judging them.
So what if I believe that some of his arguments is a bit stupid. It's not like he can prove that God exists with math or anything.
Those are valid reasons and I am not sure why you are in the bad when someone tried to shove religion down your throat.