When judeochristians conquer non-judeochristian lands massacres, forced displacement, genocides, erasement of culture, gratuite and sadistic violence, the elder and children are targeted in particular, mutilations, torture, rape and even cannibalism happens, the majority of the conquered are slaughtered and their lands taken to make room for judeochristian settler colonizers...

When Muslims conquer non-Muslim lands the innocents are mostly left alone and only combatants are targeted, buildings from enemies are repurposed to serve the new ruling state, the conquered are properly integrated into society and those who do not convert just have to pay a tax and they don't need to serve military, non-Muslims become high bureoucrats, statists, scientists, bankers, merchants...

Is this because judeochristians follow noahide rules of war? Is this why nations from the european peninsula have been so barbaric and genocidal historically?