pseudo-Christianity
/ˌs(j)uːdoʊkrɪst(ʃ)ɪˈanɪti/noun
False or spurious Christianity; a cult or religion that resembles or imitates (aspects of) Christianity.
Origin
Late 16th century; earliest use found in Philip Stubbes (c1555–c1610), pamphleteer. From pseudo- + Christianity, after pseudo-Christian, pseudo-Christian.