That's not Christians' argument at all (That we need God to know right from wrong). It became Christians' argument, but it's not. Objective morality is self evident. It can exist without God. It's the fact that people don't follow it. That's why there is God. Basically, the Torah is hell. It's what we deserve. I'm sure there's rape and infanticide and something like murder in hell. It's the punishment we deserve for breaking God's law, and dishonoring His commandments. Rather, it's Christ who establishes Grace, and a rest from working to change or fix the world. Rather, we just live according to the Law of Conscience, and are forgiven for our past.
God's objective morality does work. If you wanted to create Utopia, with no suffering, there's your handbook. And look how bloody awful it is? It's why Communism and all that other jazz won't work. The point of the Gospel is to acknowledge there are flaws in the world and yourself, but live the best you can. And to be forgiven of what you failed to do. Obviously, there's a place for war--and even rape, genocide and slavery--in the context of making a perfect world. It's like, the best world possible for humans, would require a tyrant to accomplish. That's why that Law is given into Christ's hands at the end of the age, and He'll punish the nations. Because He's the only one who could do it right, and know who deserves punishment, and who does not. Not us. As, you're right... pertaining to the Old Testament law, it is bloody and immoral, so to try and Crusade for a perfect world without any suffering, it would be fruitless in the hands of a human being. But if you wanted to rid the world of suffering, you'd have to follow the Laws in the Bible. Stone sinners, punish enemies, ravage their women, make slaves. Because that's the kind of force necessary to end the world-systems that enable suffering in the first place. To do so would make you something like Alexander the Great or Genghis Kahn. It's simply not good. That's why the Law is like that.
But we, as Christians, live by the laws of Grace. It's not our job to condemn the world. Merely warn it. It's not our job to punish the nations, but rather call them to repentance, so such force doesn't become necessary. That's why Christ said, "Do not think I came to bring peace. I did not come to bring peace, but rather the sword." That's hard to understand, I know. But, you can't imagine the depths of suffering sin causes, as it naturally reaps those things anyway. War, disease, famine, oppression and pestilence are the natural results of sin; which, in the end, people will be obstinate and hardened in their sins, and continue doing so, despite the suffering it causes. Which will cause Christ to come and judge the world for its sin; and that for the sake of the Elect, so they don't get stuck here, and so the world does not become like hell.
And I'm sure Satan knows this, too, and will seek to bind people to the Old Covenant Laws, and conquest with this in mind. That's the final straw, is when Satan takes the Law into his own hands, and exercises complete and total Lawlessness and absolute Law, in the same power vacuum. Which is why he's evil. Satan will say, "Confess 'me' as LORD, and I will absolve your sins, and you can do all your heart desires whenever you sin... however, if you do not, I will punish you according to the Torah." And he will at once tyrannize and abolish all law whatsoever in the same breath and stroke.
Mark 13:51Jesus saith unto them, Have ye understood all these things? They say unto him, Yea, Lord. 52Then said he unto them, Therefore every scribe which is instructed unto the kingdom of heaven is like unto a man that is an householder, which bringeth forth out of his treasure things new and old.
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