I said Paul did not know much about what Jesus preached. I don't consider the blood-drinking ceremony to be a major part of his preaching, do you?
Are there many instances when Paul quotes the preaching of Jesus?
Only because you are ignorant of the bible. Paul says he preached the Gospel. Paul spent time with the disciples. Peter preached the Gospel.
Major? It is the center of Christianity. It is the Gospel in its entirety. Jesus died for us. We remember that and pass this message on to others. That is the entire story. Everything else is window dressing.
Your ignorance about Christians is painful to watch. It would be better if you simply listened rather than parrot crap you read from dubious sources.