So, to summarize: the Church and all other churches east and west has been and have been wrong for nearly 2,000 years.

Jesus is not talking about the Church but - inexplicably in the midst of general teaching - has done an aside to his disciples for unknown reasons.

 The context of  "if your brother sins against you" goes right past most people. Jews are required to forgive someone who asks for forgiveness, promises to cease offenses, and makes recompense. However, there is a limit to how many times one is required to forgive since it eventually becomes clear there is no intention of genuine repentance. That's the context, and I can provide talmudic references if you'd like.

Jesus says there is no limit. He does NOT remove the requirement that the offender ask forgiveness. He does NOT remove the requirement of recompense. And He does NOT remove the requirement that the offender promise to try to amend his behavior.

Jesus was not offering Communion to the unconverted Pharisees.