Not just a few sceptics try to make a case that Paul preached a message that was different than that of Jesus the Christ. Let’s let Paul speak to the issue.
I ask you, "Has the Messiah been chopped up in little pieces so we can each have a relic all our own? Was Paul crucified for you? Was a single one of you baptized in Paul's name?" I was not involved with any of your baptisms—except for Crispus and Gaius—and on getting this report, I'm sure glad I wasn't. At least no one can go around saying he was baptized in my name. (Come to think of it, I also baptized Stephanas's family, but as far as I can recall, that's it.)
God didn't send me out to collect a following for myself, but to preach the Message of what he has done, collecting a following for him. And he didn't send me to do it with a lot of fancy rhetoric of my own, lest the powerful action at the centre - Christ on the Cross - be trivialized into mere words.
I assume I'm addressing believers now who are mature. Draw your own conclusions: When we drink the cup of blessing, aren't we taking into ourselves the blood, the very life, of Christ? And isn't it the same with the loaf of bread we break and eat? Don't we take into ourselves the body, the very life, of Christ? Because there is one loaf, our many-ness becomes one-ness - Christ doesn't become fragmented in us. Rather, we become unified in him. We don't reduce Christ to what we are; he raises us to what he is. That's basically what happened even in old Israel - those who ate the sacrifices offered on God's altar entered into God's action at the altar.
I received my instruction from the Master Himself and passed them on to you.
1 Corinthians 1:13-17, 10:16-18, 11:24