Jesus said "Only God can forgive sin. I can forgive sin!" [Spirituality & Religion]

He said is it easier to say your sin is forgiven or heal the crippled, and raise the dead? Then He healed the crippled and raised a man who had been rotting 4 days and smelled. 500 saw his body raised from the dead and were tortured for witnessing. Who was He? If you say he was a Prophet then Jesus was a liar, because he said he was God? No good prophet is a liar, right.
1. Liar?
2. Lunatic?
3. God?