Source please - Sea Breeze
If you give the Ammonites into my hands, whatever comes out of the door of my house to meet me when I return in triumph from the Ammonites will be the Lord’s, and I will sacrifice it as a burnt offering ... he did to her as he had vowed - Judges 11
If Jephthah had thought better of his vow and spared the life of his child that would have been the point of the story. Instead the point of the story is Jephthah's willingness to keep his vow and his daughter's acquiescence. The OT is full of examples of Yahweh communicating his wishes to his prophets. On this occasion he remained silent and accepted child sacrifice.
Everything else is hand waving by embarrassed theologians.
God could end evil and suffering by tomorrow morning if he wanted. All he has to do is forcibly take away our free will - Sea Breeze
Countless millions of humans have suffered and died as a result of 'natural evil' that has absolutely nothing to do with free will. Your god does not get to blame the victims. A tsunami proves beyond all doubt that the god of christian theism does not exist.