Genocide of the canaanites is definitely in the Bible but possibly/probably didn’t happen as much as the Bible says. I’m sure there were times when whole cities were put to the sword but a lot of the stories in the Bible seem more like they were made up later as a way of claiming racial purity. It made it so the Hebrews could say “there’s no way we’re mixed with canaanites cuz we killed all the canaanites”