Ebionite Christians were the true Christians: Aramaic-speakers like Jesus and his apostles, they would have been the Jewish witnesses to Jesus' ministry and preaching. From this starting point, Jesus' teachings spread. They also, however, spread from Saul of Damascus, who renamed himself Paul and who preached an anti-Ebionite version of Christianity for the gentiles, which was much easier to follow and more popular.
Gnostic Christians: With stories, myths and beliefs that are exactly the same as Christian ones in many of the little details, gnostic beliefs manage to pre-date Christians ones by over 200 years. They understood what the stories of the NT really meant. Jesus didn't really exist, but was a collection of such earlier stories, rewritten in Greek, with Greek names. This is the approach taken by historians such as Freke & Gandy.
Pauline / Roman Christians: When the Roman-backed instance of Christianity went in search of the ancient centres of Christianity, they discovered to their horror that the Ebionites and Gnostics pre-dated them. Their un-Christian answer was to edit verses, burn books, arrest and harass the other poverty-stricken Christians until no opposition was left. The form of Christianity that we have inherited from the Roman Empire is far from what Christianity originally was.