You're not really understanding the issues. First off, Jesus never taught that adulterers shouldn't be killed.
Of course he did, we are all sinners and therefore unqualified to execute other sinners. But Jesus, the one person in that entire crowd who was qualified, didn't execute the adulteress. How do you explain that if Jesus believed adulterers should be killed? Jesus told her, "neither do I condemn you". According to your argument he should have said, "I should (do) condemn you".
I dont know how anyone can read that story and conclude Jesus was telling us to stone adulterers. If you were right Jesus would have told the crowd, "yeah, go ahead and kill her". Why didn't he? Why did he come up with a response designed to indict both the crowd's conscience and the very law calling for the execution of adulterers?
In a just Christian society the victims of adultery would retain the right to have the covenant-breaker in that relationship punished by death. That's Biblical justice....
Thats OT justice under Jewish law. The pharisees were the legal arm of Jewish society, they were asking Jesus if the law of Moses should be enforced. He said no, nada... No execution, no punishment at all, nothing.
What Jesus was doing is condemning the hypocrisy of the Pharisees while giving a cryptic answer to a trap question.
What hypocrisy? That was the law... The law was guilty of hypocrisy. The "trap" was a suspicion Jesus didn't support the law so they asked him if he supported the law. He didn't.
His answer was not cryptic, it was a simple question - who among you is without sin? And yes, Jesus was pointing out the hypocrisy of sinners executing other sinners. Forgive us our trespasses as we forgive those who trespass against us. Apparently you think Christians can both forgive and execute trespassers. By that standard God can both forgive and punish Christians. That isn't how forgiveness works.
Moses never said "divorce your wives for no good reason." He did tolerate divorce. Jesus clarified that divorce is allowed only in the case of sexual immorality, not for "just any cause." Moses doesn't disagree with this at all.
What restrictions did Moses place on divorce? What restrictions did Jesus place on divorce? They did not agree with each others restrictions.
As for the sabbath, this is an issue a lot of people don't understand. Not all of the death penalties in the Old Testament had to be executions in every single case, and this is one of them. Keep in mind that the people of Israel specifically had to ask God what was to be done to the man who picked sticks on the sabbath, even though God had already said to execute sabbath-breakers. This proves that there is sometimes some flexibility in the law and sometimes mercy could be shown. Nehemiah, for instance, locked the sabbath breakers out of his city until the day ended, but did not kill them. There's not a hint in any Biblical text that what he did is wrong.
Moses and his God didn't show mercy and Jesus didn't ask for it. The law had just been given to Moses and this was the first recorded case of violating the Sabbath. The people were unsure if the guy was guilty so they asked God to clarify the law - guilty!
So there's a bit of speculation involved, but most likely the guy who picked sticks on the sabbath was flagrantly and without regard breaking the sabbath. My guess is he was flaunting it. If I recall correctly the men at Westminster said the same thing.
How does one flagrantly pick up sticks? He was found in the wilderness gathering firewood and brought to Moses and they executed him. Jesus wasn't exactly shy about violating Sabbath law - he committed his violations in full view of the authorities and this poor guy was out of sight and mind. Now, if Jesus was walking around violating the Sabbath why do you think he'd support killing a man for gathering firewood?
sorry for the long post