The belief into the Antichrist. An Antichristian is the reverse of a Christian. They deny Jesus's teachings of forgiveness and righteousness. They will intentionally simply take Christianity's holy teachings and alter it to an Antichristian following, like "forgive your opponents" becomes "hate those who aren't your enemies" or "hate your enemies". Antichristianity and Satanism won't be the same thing so cannot confuse the two because Antichristians never worship the devil, obtained no genuine road to everything. They can twist Jesus's image into an evil mastermind, but that's uncommon.
Opposition or contrariety into Christian faith.
(letter.) Opposition or contrariety on Christian religion.