Two more related heresies this week, both of a Sabellianism flavor.
Noeticism is a 3rd century, antitrinitarian heresy that says God moved into Mary as a single spirit (with no distinction in the Trinity), became Christ upon birth and the Father himself died on the cross. Noeticism is considered the forerunner of Patripassianism.
Patripassianism (also spelled Patripassionism) is a 3rd century heresy that believes God the Father also suffered with Christ on the Cross (or that the Father alone suffered on the Cross), and anything that happened to Jesus happened to the Father as well. It is considered heretical because only the human nature of Christ could suffer, not His divine nature. It is an antitrinitarian heresy because it denies the distinctness of the three persons in the Trinity. Patripassianism is considered to be a Sabellianism heresy, but the “father” of Patripassianism is Noeticism.