Most of the people who were slaughtered by the extremists were Muslim. Same as about 98% of the people killed by Al Qaeda were Muslims. Sorry, don't know what you mean by "retaliation."
Note: From https://www.snopes.com/fact-check/nigeria-christians-muslims/
"Reports by Breitbart and the Christian Post website failed readers by presenting a woefully narrow viewpoint on the conflict, emphasizing only the religious affiliations of the participants while neglecting to mention what impartial experts have highlighted as being the primary driving force behind it: a dispute over natural resources and land usage. While Breitbart’s article provided details of several reported attacks by Fulani herders on farmers in Kaduna State in February and March 2019, it did not mention the attack on the mainly Muslim Fula ethnic group, which was the single largest reported atrocity during the time period in question."