Heresies

Dontanism - a belief started by Donatus that said that people who betray or give up the Christian faith are not allowed to be readmitted into the church.

Marcionism - started by Marcion of Sinope that believes that the OT God was wrathful and angry as opposed to the NT God who is kind and forgiving. Also, Jesus is not any deity but rather a chief apostle of God's.

Montanism - named after Montanus which believes that you have direct revelation from God. They were false prophets.

Arianism - attributed to Arius teaches that Christ did not always exist, but was created and was separate from the Father.