Litmus test for Biblical statements
Biblical statements can be tested for their authenticity based on what we know about God. In looking at these statements, the question to be asked at all times is, "Would this be something that an all-knowing, all-powerful, all-righteous creator of the universe would say?" If the answer is in the affirmative, then the statement can be said to be coming from God. If the answer is in the negative, then it cannot be said to be coming from God.
Thus, when we look at the constant dissatisfaction that we see God express in human beings, we can decide whether or not this is something that would come from an all-knowing creator. Would an all-knowing creator have this little understanding of what he has created that he would say such a thing? If man is made in God's image, then man is made with the same propensities as God - a being that creates rather than obeys. These tendencies would be found in people by design, and people expressing them would be expected as a function of this design. So God yelling at people for expressing propensities that he put in them would not be in character to an all-knowing, all-righteous creator. This means that such statements cannot come from an all-knowing, all-righteous creator God and must be the work of less than divine intelligence.
Same with the portrayal of Jews as stubborn and stiff-necked. A nation would have to be stubborn and stiff-necked in order to be people of God. People who are not stiff-necked and stubborn would not remain people of God for long and would assimilate into whatever is around them. This being easily apparent to a mere mortal's intelligence, would be far more so to a divine intelligence; which means that statements of this nature likewise cannot be the statements of an all-knowing all-righteous being and must be the work of much less than divine intellect.
We also see much less than divine intelligence in what is said in the Bible about women. We have seen in history women achieve all the intelligence and character that men have achieved, with women from Queen Elizabeth I and Marie Medici to Marie Curie, Margaret Thatcher, Ayn Rand and Sandy Lerner making more than adequate leaders, scientists, thinkers and entrepreneurs. A statement made by an all-knowing all-righteous God would not be easily disproven by reality, yet we see reality consistently disprove the misogynistic statements made in the Bible. This likewise means that such statements cannot be the work of an all-knowing all-righteous God and must be the work of much less than divine intellect.
The things that are ascribed to Satan can likewise be tested by what is said to be Satan's character. This we see with Jesus's claim that Satan is the "father of the flesh." If Satan could create something as complex as human body, with 3 trillion cells and multiple organ systems existing in homeostasis and staying alive in some cases for over 100 years, then Satan must be an exceptionally fine creator. This is in contradiction to the character ascribed to Satan as a being that creates nothing but only steals and deceives. This statement therefore cannot be true in light of Satan's character and likewise cannot be the work of a divinely inspired mind.
There are any number of statements in the Bible in which God is claimed to be telling people to commit genocide, to take for wives the neighboring tribes' women, and to destroy whole civilizations and leave not even a memory of them. Would a real creator do that to what he has created?
Would an omnipotent being need anyone's sacrifice to himself in order to save or damn anyone?
Would an omnipotent being, who can do anything, be able to only beget one son?
Statements ascribed to God must be looked at from what we know God to be - an all-powerful, all-knowing, all-righteous creator of the universe. If these statements are not in character to an all-powerful, all-knowing, all-righteous creator of the universe, then they do not come from God. And what we see in many Biblical statements is the work of intelligence that is not only not all-knowing or all-righteous but is intellectually and morally inferior to that of many mere mortals. Which means that these statements cannot have come from God and are a work of mortal men.