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.