Q. 1. What is the heresy of "Patripassianism?"
A. 1. The heresy of "Patripassianism" is the belief that God the Father and Son are not two distinct persons, and therefore God the Father suffered on the cross as Jesus did.
"Patripassianism" had its beginning in the third century AD. It was referred to as a belief ascribed to those who followed Sabellianism, after its founder Sabellius, especially by the chief opponent Tertullian. Sabellius, who lived in Rome, was considered a founder of an early movement. He was a Catholic priest who was excommunicated from the Church by Pope Callixtus I in AD 220. Major followers of Sabellius were Praxeus and Noetus.
"Patripassianism" is a heresy that asserts that God the Father, not God the Son, incarnated and suffered on the cross for humanity's redemption. This Heresy denies person of Jesus Christ, the Son of God. It also distorts the spiritual transaction that was taking place at the cross, which the Apostle Paul described as follows: "God [the Father] was reconciling the world to himself in Christ [the Son], not counting people’s sins against them... God [the Father] made him who had no sin [Jesus] to be sin for us, so that in him [Jesus] we might become the righteousness of God [the Father]." (2 Corinthians 5:19, 21)