This proof has already been done by many. There is more than just two theories of morality.
The proof of what? You mean you asked for proof of humans marrying bizarre entities has been shown to be true by many others, or did you mean something else.
But, you do bring up a good point. God was invented in part to give authority to people's subjective morality or laws. Otherwise people would have no reason to respect the law save whatever power the current earthly authority had over them.
Ok, first this is a philosophical kindergarten mistake. You made a claim to absolute truth. Therefore by the rules of philosophy and logic you must post the absolute proof that you claim is true. Not only did you not even attempt to supply evidence for your revision of history but you can't supply it even if you wanted to. It is impossible to prove what you claim about thousands of God's throughout history.
Now some evidence against your ridiculous theory (which by the way I once held as a teen ager and am now thoroughly ashamed of)
1. You might invent heaven, but you would not invent a Hell that everyone was going to wind up in unless they obeyed laws that were extremely inconvenient.
2. You do not put your worst failures in that same text and as Paul did "admit he was the chief of sinners".
3. This is a principle of law that men do not claim to have done wrong unless they are generally sincere.
4. History shows that men will create laws, and even risk death in order to kill others that did not agree with those laws. History shows very very few who willingly gave up their lives than to obey made up God's and laws without a fight. And Christianity probably accounts for over 90% of them.
5. Those who without any doubt knew the absolute fact of whether Christ rose from the dead or not claimed he did and obeyed him without gaining any earthly riches but in spite of incurring the wrath of their own nation and the greatest empire on earth. IOW like the founder of Harvard law said, if sincerity concerning something they knew the truth of was not their motivation no other motivation exists.
Any thinking man trained in theology can tear down the biblical God of convenience story with hundreds of inconsistencies in it, but I will stop here.
But your demands of proof work both ways. In order to assert you religious morality, prove your god exists, or is even internally consistent.
This is a whole new issue and irrelevant. I do not have to convince anyone I am right to be right. Regardless the bible was not written to govern an earthly theocracy. It was designed to govern an individuals heart and to clearly point out the obvious problem of sin, it's origin, and it's solution. It is not designed to govern Europe but can you imagine the relative moral Utopia Europe would be if everyone there actually obeyed the NT? You answered an ontological proposition with an epistemological response. That is probably a 5th grade philosophical mistake.
BY the way I mean no disrespect when I point out your mistakes. I judge ideas not people.