Someday you may get it....
There were no Christians on earth prior to Pentecost.
Jesus did not come teaching about how to walk in the Spirit to control the sin nature.
perhaps look at it this way, that He came teaching the Judaism He had instructed Moses and the prophets to teach, and in doing so inviting us to become Christians.
remember the rich young ((most likely pharisee)) man who came to Him and said he had kept all the commandments and wanted to know how to inherit life?
Jesus looked at him and loved him. Jesus loves us all, but why isn't this written about everyone? this man followed the Judaism of Moses as well as he could, but knew it was not enough to grant him eternal life - and he knew Jesus could give him the answer, the true Way.
in a sense he understood that Christ came teaching Judaism ((the true Judaism of Moses)) and inviting us to become Christian, following Him. He did not contradict his statement that he had perfectly kept the Law, but still told the man, "
there is still something you lack"
as Paul explains to us in Romans, God came to propose to us a marriage. He makes His estranged wife Israel, who could not attain righteousness by law, jealous with us, who are given righteousness by faith.
He came to betroth us to Himself - and Christianity is walking in that state of betrothal.
so yes, teaching the estranged wife how she should have been faithful, not how to be His betrothed bride while those He was speaking to had not accepted His proposal of marriage. He taught them to repent, and return to Him, so He could heal them.
how to walk as His betrothed? this comes after the proposal is accepted: after He rose, and gave us gifts, and His Spirit, and departed to prepare for the the day of the wedding feast.