A Christian is a follower of Christ, not a follower of an organization. The very fact that you make a comment that followers of Christ who don’t also follow an earthly (mammon) organization are not Christians is very telling.
Many of the "Christians" here are followers of Paul, not Christ. We have been thoroughly instructed by some of the more faithful that the Gospels are for the Jews only, or that the Gospels must be viewed through the Pauline Epistles.
According to them it is Paul to whom we must turn; Jesus is irrelevant to them except as a figurehead. But what does Jesus instruct the Apostles?
Matthew 10: 1* Then he summoned his twelve disciples* and gave them authority over unclean spirits to drive them out and to cure every disease and every illness.a 2The names of the twelve apostles* are these: first, Simon called Peter, and his brother Andrew; James, the son of Zebedee, and his brother John; 3Philip and Bartholomew, Thomas and Matthew the tax collector; James, the son of Alphaeus, and Thaddeus; 4Simon the Cananean, and Judas Iscariot who betrayed him.
5b Jesus sent out these twelve* after instructing them thus, “Do not go into pagan territory or enter a Samaritan town. 6c Go rather to the lost sheep of the house of Israel. 7As you go, make this proclamation: ‘The kingdom of heaven is at hand.’d 8* Cure the sick, raise the dead, cleanse lepers, drive out demons. Without cost you have received; without cost you are to give. 9e Do not take gold or silver or copper for your belts; 10f no sack for the journey, or a second tunic, or sandals, or walking stick. The laborer deserves his keep. 11g Whatever town or village you enter, look for a worthy person in it, and stay there until you leave. 12As you enter a house, wish it peace. 13If the house is worthy, let your peace come upon it; if not, let your peace return to you.* 14* h Whoever will not receive you or listen to your words—go outside that house or town and shake the dust from your feet. 15Amen, I say to you, it will be more tolerable for the land of Sodom and Gomorrah on the day of judgment than for that town.i
Jesus gave teaching authority to the Church, and not to every Tom, Dick and Luther at their own whims.