Theres a little bit of revisionist history going on with regards to "The Aztec Question".
It wasn't the Christians kicking up a stink at the prospect of having the Aztecs batting for team Satan. It was the real, genuine, honest fans™ complaining that it was the soft bigotry of actual Satan worship that was the problem. How dare you assume that just because they're brown, enslave thousands of their enemies and engage in human sacrifice that they're not good people. What are you? Some kind of bigot?
If memory serves me correctly (and I'm trying to blot most of the stuff about Trench Crusade from my mind like a childhood abuse memory at this point), it was a Christian that raised the question of having the Americas in the game in the first place and it all went downhill from there. To paint it as everyone going full 1488 at the thought of Aztecs being included is a little disingenuous.