But I'll ask it...
Is it possible that many of the prohibitions in the Bible (ie prohibited conduct/sin etc), are eternal prohibitions (i guess one that would indisputably be here is murder) or more temporary bans for some sort of social purpose appropriate at the time (perhaps like Kosher dietary laws which at least in the Christian tradition are no longer required).
the interesting thing about the Kosher dietary laws, is that they were the third set of dietary laws mentioned the bible, not the first and only set.
In Gen chapter 1, the diet was vegetarian. In Gen chapter 9, all forms of meat was added to man's diet after the waters of the Flood receded. Then, after the Exodus, the Law of Moses introduced the Kosher dietary laws. (And I would guess, based on other passages, that the vegetarian diet will come back into effect during the 1000 year reign of Christ)
So, the dietary laws are an example of a category of God's law that has not remained uniform.
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If so what forms of conduct or what actions would fall into each category?
Well, there are 613 laws within the Law of Moses. If you throw all 613 out and use the book of Genesis to define morality - I think you would end up with the morality described in the New Testament.
In fact, you could pretty much sum up New Testament morality in the following:
1) Love God with all your heart
2) Love others as yourself
3) keep sex within the context of marriage
4) don't play around with the blood of animals for religious purposes
numbers 1 and 2 ere what Jesus stated as the summation of the law, and numbers 3 and 4 were the instructions to the Gentiles from the Jerusalem council in Acts chapter 15