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In your estimation ISIT, what did Jesus Christ do with sin on the Cross?
I want to answer this................
Our Lord Jesus defeated sin on the cross by giving us a way to be forgiven of them and be reconciled to God !!!
How we receive that remission of our sins is where the teaching goes one way or the other, false teaching says repentance and baptism not needed as it also does away with how one walks in the faith.
True teaching comes from one receives that remission when they after believing repent of their sins, get baptized, and then continue to walk the proper way on the path, as Apostle John shows His blood continues to give us remission of our sins when we walk in the Light/Spirit......(1 John 1:7)