Jesus prayed for God not to hold their sin against them but those are the same people who before that had told Pilate “let his blood be on us and on our children. “
They were granted their wish, as these same people were destroyed in the fall of Jerusalem years later.
Jesus said, “Forgive others as you have been forgiven.” That means repentance is required.
But you notice that not all your repentance has been done and yet Jesus has already forgiven you.
If you want an impossible God, then you use sophistry.