First, Isaac has to be your son, so unless it’s your own child whose baptism you have to cancel, you ain’t Abraham. Stop egging on Abraham from a distance. You should be devastated by what he’s about to do.
Second, Abraham was willing to kill his son even though he knew it to be wrong. He didn’t come up with lame justifications. It was murder and he knew it. It certainly was not done to “protect Isaac.”
Third, the command came direct from God, a deity he knew face-to-face. He did not read it on a cuneiform tablet he had happened to notice that morning. Even if the tablet were to have come from a respected source, that source had been known to get things wrong from time to time.
Fourth, he didn’t end up doing it! If you’re a bishop about to refuse a naming and blessing even though you know it’s wrong, I suppose you’ve passed the test. Expect an angel to order you to change your mind. Happy ending.