A Facebook post by Nathaniel Runels on group Calvinism, Arminianism, Pelagianism, Wesleyanism, Finneyism, Lutheranism… . For context, Jephthah promised God that if God helped him then he would offer to God (as a burnt offering) the first thing he saw open returning home:

Jdg 11:30 And Jephthah vowed a vow unto the LORD, and said, If thou shalt without fail deliver the children of Ammon into mine hands,
Jdg 11:31 Then it shall be, that whatsoever cometh forth of the doors of my house to meet me, when I return in peace from the children of Ammon, shall surely be the LORD’S, and I will offer it up for a burnt offering.

Jephthah sees his daughter and fulfills his vow. Mr Runels writes:

Jephthah’s daughter was not a human sacrifice. She actually went out to mourn her virginity(38) the verse you left out. “And he said, Go. And he sent her away for two months: and she went with her companions, and BEWAILED HER VIRGINITY upon the mountains.. Most likely she was set a side as a virgin, not to be married, but in total service to the Lord. (Jdg 11:39-40.)”And it came to pass at the end of two months, that she returned unto her father, who did with her according to his vow which he had vowed: and she knew no man. And it was a custom in Israel, That the daughters of Israel went yearly to lament the daughter of Jephthah the Gileadite four days in a year.” Jeff Swayzee I am not here to argue either side, but I believe that you may have mis-read this passage. She was only said to have mourned her virginity, and she knew no man. Never said anything about death. And God’s character would not permit Him to receive such a sacrifice.

God does not demand human sacrifice.