He took on the religion of the Midianites and accepted jahweh as his God.
We are told that his vow was kept, and thus we know that human sacrifices were sometimes offered to jahweh.
So Deborah called on all who worshipped jahweh to rally in His cause.
This made jahweh so angry that he smote the people, and slew more than fifty thousand of them.
The children of Israel, having been sent out by jahweh to punish the Midianites, "slew all the males."
I could find in the Bible more instances of jahweh's cruelty and barbarity and lack of mercy than I can find room for.
The people of Israel cried unto jahweh and He raised up to them a deliverer, and the land had rest.
When the man turned bad on his hands, jahweh was angry, and cursed him and his seed for thousands of years.
1869, hypothetical reconstruction of the tetragrammaton YHWH (see Jehovah), based on the assumption that the tetragrammaton is the imperfective of Hebrew verb hawah, earlier form of hayah "was," in the sense of "the one who is, the existing."