Christianity created and adopted the Trinity concept many years after Jesus died. Christianity kowtowed to Constantine and tied a reasonably good Jesus to a demonstrably evil Yahweh/Allah.
This is incorrect. The New Testament upholds the Trinity doctrine and denounces Gnosticism roundly. It clearly says that the Father, Jesus, and the Spirit are all God, but there is only one God. As for Gnosticism, 1 John 4:2 and 2 John 7 both condemn it, as well as possibly Christ himself when He denounces the Nicolaitans in Revelation 2:6 and 2:14-15.
It was Augustine, not Constantine, who reintroduced Gnosticism into the church but managed to get it accepted as Scriptural doctrine in the form of Original Sin.
