What is a word for someone who is 'anti-Christian' in the way one is 'anti-semitic'? For example,
Someone who is X is opposed to the doctrines of Christian theology and prejudiced against practicing Christians.
This not to say they are atheist or otherwise advocating for another religion. Rather, they advocate for the destruction of Christianity as a religion. This notion is also distinct from 'internal' heresy, as in a theologian that rejects mainstream Christian theology and advocates alternative readings of the texts or philosophical concepts.
Best Answer
The structure of the two words should have given you a clue. It's
anti-Christian
Of course, the varying values of Christian from the only true one died on the cross to my church to all the churches to all of G-d's children means that it's always going to be a fairly nebulous phrase. It's still the correct term for the idea.
Unhelpfully, anti-christian is a synonym but antichristian is a mess since it is used as the adjectival form of the Antichrist as well.