A person who is prejudice against Christianity. Citophaus is the noun and citophausic is the adjective.
Akim: I hate it so much. Like why do they have to praise God and act like that?!
Lily: Akim, I’m a Christian. Don’t say that! Your such a citophaus.
OR
Akim: I hate Christians!
Lily: Akim! Your’re so citophausic!