"Is Jehovah ridiculous for asking Abraham to burn Issac? And is Abraham ridiculous for trying to do it?"
Why would people question Abraham's ATTEMPT at sacrificing Isaac when it was not meant to go through to completion. It was a test of faith.
Gen 22:2 "Take, please, your son, your only son whom you so love, Isaac, and travel to the land of Mo·riʹah and offer him up there as a burnt offering on one of the mountains that I will designate to you.”"
vs 8 "To this Abraham said: “God himself will provide the sheep for the burnt offering, my son"
vs 10 "Then Abraham reached out his hand and took the knife to kill his son."
vs 11 "But Jehovah’s angel called to him from the heavens and said: “Abraham, Abraham!” to which he answered: “Here I am!”
Then
he said: “Do not harm the boy, and do not do anything at all to him,
for now I do know that you are God-fearing because you have not withheld
your son, your only one, from me"
See. It was a test and Abraham passed it and it was never meant to hurt him.
Jephthah was the one that made the vow. He would not kill and burn another human from his household. So Jehovah would not want him to kill and sacrifice another human.
The problem is that people read the words in the Bible, though badly written and reading not from the writer's perspective, in a vacuum and take it without considering other texts.