His martyred death as sacrifice for the remission sin is a false religion that was created centuries later.

But he was incorrect in saying ‘do this and you will live’. Everyone lives on after death. Eternal life is not something that is granted based on one’s belief or actions.

But since the Sadducees did not believe in life after death and this man had been listening to Jesus say there was, this was Jesus’ way of getting him to believe and linking it to the preferred way to live which is doing good and believing in the Creator Great Spirit.