Muslims make up a slightly disproportionately large share of these attacks. Even though they make up less than one percent of the US population, they account for 8.7 percent of these killers (six in total) and more than the number of Christians. This rate is a much lower than what we observe in the world as a whole where Muslims have committed 23 of the 25 worst mass public shootings since 1970 and 42 of the 50 worst attacks.
Other killers who are explicitly identified only as “anti-Christian” are about as common as Christians, with three such killers. One of those killers was the 2015 Oregon Community College massacre where the killer shot those who reportedly told him that they were Christian. another killer was identified only as an anti-Semite.