Okay, maybe "Amen" isn't the name of a pagan deity, but what about "God"? Doesn't Isaiah 65:11 say that "god" is the name of another pagan deity, so we shouldn't say it?

No, not really. This is the same essential error as the "Amen" argument.

https://soilfromstone.blogspot.....com/2020/02/is-god-