Abraham could have stopped believing that this God who had called him was really different from the gods he had left in the human-sacrificing city of Ur, and obeyed no matter what, as just one god among many.
Abraham could have held onto his belief that this God was different from the gods he had left and as such God would never ask such a thing as sacrificing the son of the promise.
Either way, the promise was doomed. Or Abraham could have found the third way.
This is the one where Pastor Jenn completely loses it in the middle.