The real problem is that we believe our sins are not as bad as Hitler’s - but to God, all sin is the same and is punishable by death! Only in Christ can this certain (and well deserved) death be avoided - but not by anything we can say or do. If Hitler asked for the forgiveness of Jesus, he would receive it the same as we would - - our sins are no worse than his.
All it took on Adam and Eve's part was ONE sin, the sin of eating forbidden fruit, something which most of us I daresay, would consider a minor offense.
But this is where James 2 comes in....
James 2:8-11 If you really fulfill the royal law according to the Scripture, “You shall love your neighbor as yourself,” you are doing well. But if you show partiality, you are committing sin and are convicted by the law as transgressors. For whoever keeps the whole law but fails in one point has become guilty of all of it. For he who said, “Do not commit adultery,” also said, “Do not murder.” If you do not commit adultery but do murder, you have become a transgressor of the law.
We look as sin as some being more serious than others, like lying not as bad as murder. And there were different penalties for some crimes than others, indicating a more serious offense occurred.
However, the issue with sin is not what the sin is that we commit, but the holy God whose Law we transgress.
The sin is an affront to God, no matter what the particular sin was. And for God, *The wages of sin is death*. Period.
And as far as Hitler or other evil despots or criminals, there but for the grace of God go I.
None of us know what we're capable of given enough opportunity and the right circumstances.
Jesus forgave the thief on the cross who was being crucified for murder and insurrection, no questions asked.
Do I think Hitler did genuinely repent before death? No. But if he did, God saved him. And if God is willing to do it for someone like that, He'll do it for any of us.