Not at all until you show us some Christian doctrine that supports their actions. David Koresh thought he was Jesus Christ and diddled little girls. Has nothing to do with christian doctrine and is instead purely a product of a disturbed mind. Muslims who kill the unbelievers have an abundance of Islamic doctrine that directly and explicitly commands them to "fight", "kill", "slay" and "smite the necks" of the unbelievers. Just as Muhammad did. Just as the first four rightly guided caliphs did. Within 80 years of Muhammads death the muslims were waging jihad in Spain to the west and Afghanistan to the east.
Within 300 years of Jesus death, christianity had spread around the entire med sea. Without waging a single battle but intead by preaching the word of god. Persecuted by the then governing authorities, every step of the way. And then the Roman empire adopted christianity. Catholic doctrine replaced Christian doctrine. Christian doctrine became whatever the catholic church said was doctine.
But it does matter what the doctrine says. When they act according to the written doctrine you can point to the doctrine as their motivation. When they act contrary to the doctrine, even though they claim to be christians, they are still acting contrary to doctrine.