Hence it is an interpolation of those who have no sense of RATIONALITY!
(Now it follows: If this is interpolation, then its greater story of ransom sacrifice too falls into this category. It could be even this way--to give credential to ransom teaching, interpolators wanted some precedent, hence created story of Abraham)
Story of Abraham’s obedience lacks rationality throughout. God delays the birth of a child, and then permits birth. If God then asks for sacrifice of that child, Abraham will not hesitate as he had experienced the gift of God. That too, when God himself asks, who will hesitate. In this sense also, there is no logic or rationality!
Abiathar, what I see in you is a man so desperate to hold on to his irrational faith in an ancient book being the word of God, that rather than accept the clear evidence of its very human authorship he resorts to very creative and irrational gymnastic reasoning by separating the inconvenient evidence away from the book by calling it "interpolations". You are clearly in denial. You see the obvious folly in many bible accounts but you're not honest enough with yourself to accept and follow this evidence to its logical conclusion - that the bible is not the word of God.
Instead, you conveniently make up your own rules to fix the game in your favor. You are like a woman whose husband commits murder and out of sheer desperation in her unwillingness to accept that her husband did it she labels all the mountains of evidence against him as being planted or all lies. By your disingenuous reasoning, you essentially make your holy book unfalsifiable because any evidence in the text that demonstrates its fallible nature and very human origin is quickly labeled by your as an interpolation. Unfalsifiable claims are bogus claims! Your reasoning reveals that you are living in denial.
What happens 2000 years from now when human enlightenment progresses further and the biblical claims that you now accept as moral is exposed as immoral? What are the likes of you gonna do then - label those bible accounts as interpolations also? You're just resorting to desperate tactics in bid to make your ancient book written by less enlightened men living in a harsh ancient culture look good in our more modern and more enlightened world.