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.
Me: I don't consider the blood-drinking ceremony to be a major part of his preaching, do you?
You: Major? It is the center of Christianity. It is the Gospel in its entirety.
The eucharist is the Gospel in its entirety? More important than the Sermon on the Mount???
What you are saying is that God did not send his son to earth to tell the people how to live, he merely sent him here to die. That makes no sense.
You: Jesus died for us.
One man cannot die for the sins of another. The Old Testament says that three different times. Each man is responsible for his own sins.