It could be argued that Old Testament justice was more merciful than New Testament Justice. At least in the old testament you were quickly stoned or hacked to death, or enslaved for a mere lifetime. One's torment for questioning Jesus is an eternity of torture, for even the slightest offense.Then why have Christians kept Old Testament as part of Bible? Bible is not about justice, it is about a psychologically disturbed person who was born out of matrimony and thought (or whose followers think) that he was son of a God. See how he cursed the cities which did not accept him.