If Jesus is God then he had the right, to forgive and say sin no more. He was without sin.
But he does not expect YOU to judge.
You are correct, upon my own opinion, or puny “authority” I cannot judge. However, I certainly can discern—looking to the Word of God, who confesses Christ and who doesn’t.
It is ABSURD, that in a post above, a Christian says he simply cannot tell if Hitler was a Christian. OF COURSE HE WAS NOT!!!! Is it judgmental to say: Since he never confessed to being a Christian, AND the fruits of his life CERTAINLY showed him to be demonic....that is in the tens of millions he murdered or misled....”HITLER WAS DEFINITELY NOT A CHRISTIAN”?
Of course King is a different matter. He had some wonderful fruits: Racial justice and desegregation. That is he was a key figure in undoing one of America’s most egregious sins: Racism.
But hey, Thomas Jefferson was a key Founding Father, making America a leader in Freedom and Justice, and representative democracy. 1000 years from now, if the world endures, Jefferson will still be known as a man who greatly influenced the whole world for good. However, Jefferson...like King...in his own words, denied the deity of Christ. Jefferson, like King—and Ghandi—was not a Christian.
Does God use non-Christians to do great goods? OF COURSE. We need to be committed to truth however, and not every “good man” worldly speaking, was a Christian.