Genesis 22. Notice how when the angel shows up to to tell Abraham not to sacrifice his son, it suddenly starts calling him Yahweh instead of Elohim. Which almost certainly means the second portion is from a different author. There is a number of stylistic differences in the writing.

Then see how the "you have not withheld your son" speech repeats itself after that discourse, another marker of interpolation. Then Abraham comes down the mountain alone, and is told that he is conceiving other children.

Isaac never appears in an Elohim text again. The redactor inserted a very short narrative about him, which consists entirely of ripoffs of Abraham's life.

And it turns out, some ancient Jewish people apparently had this text, because they speak of Isaac's sacrifice as actually taking place. One even refers to his ashes.

So the real story goes like this: this Elohim figure demands child sacrifice, and Abraham goes through with it. Which might also mean that the whole "Torah" is an evil book, because "the lying pen of scribes" asking for sacrifices at all is one of the complaints made in Jeremiah, let alone child sacrifice.

The new narrative contains a symbolic message which should be recognizable to Christians. But it is a rehabilitation of some absolutely vile pagan myths, and this is why taking any of it literally is so dangerous. It also means we should not instantly dismiss ideas about a "demiurge" as crazy, because they are partly correct. For the most part, you have the prophets, wisdom literature, gospels, and the pre-pastoral Paul on one side, and the Torah and narrative books of the Old Testament, Revelation, and the pastoral and catholic epistles on the other. The latter always derives from awful pagan traditions. The Pharisees favored the latter, which is why they were so bad. The proto-orthodox church also came to take this side, and they are responsible for just as much persecution as the Romans and Jews (in fact the Catholic Church is Rome). Not quite so clear-cut as "two gods", but it's pretty close. The first group is the side of direct relationship and revelation, or "gnostic". The second is the pagan side of human, fleshly, worldly ways, and that of organized religions and human institutions with strong hierarchical authority. Take your pick, but they cannot be reconciled literally.