there is no son-murdering god in any other Abrahamic religion than christianity. what are you talking about?
this is the problem with pop-atheism\vauge-agnosticism. they think everything is christianity which had the misfortune of being the religion that was being employed while they have having their teenage angst tantrums
The reason that Christianity says to love other people is because we are imperfect and can change. Demons are fallen angels with supreme intellect and power who made an intelligent choice to oppose God (according to the Christian demonology) who will never change their mind back.
That's why loving demons is a waste of effort...according to Christian demonology.