I saw a video concerning this. Another factor, directly caused by Islam, is the makeup of these killers.
They are essentially roving gangs of sexually oppressed incels. In that area the Muslims are polygamous and often have many wives. As in 1/2 a dozen even more. Due to unequal distribution of resources and severe poverty, the young women must become members of harems of men with wealth (usually old cattle herders who hire armed guards). This leaves the high T young men alone and frustrated. Due to the teachings of Islam they see Christian girls as legal prizes to be won with violence.
Boko Haram was used in the video as an example. They often raid villages , Massacring the men, old and carrying off women, girls for their wives. You probably remember the school they raided, capturing many dozens of girls.
It’s a 7th century religion that has people using 7th century customs.
https://theweek.com/boko-haram/64201/boko-haram-kidnapped-schoolgirls-forced-to-become-militants
Where’s po-faced Michelle with her “Bring Back Our Girls “ sign?