Hey, to be fair at the time the Exodus story was synthesized, it was a henotheistic religion, monotheism didn't show up for another couple hundred years!

So at the time, nobody thought of Yahweh as all knowing or all powerful, just possessed of "god-like" knowledge and power, and clearly tougher than the Egyptian gods (which were assumdd to be real, but you just weren't supposed to worship them) because he was able to kill all them Egyptian babies.

The blood-over-the-door was basically proof you were a paid-up subscriber to the Yahweh sacrifice plan. "Ah sweet you sacrificed a lamb, no baby murder for you fam."