Comment on Moparbyfar's post
It's no problem. The simple explanation is that Angels and Gods, as they are referred to by religion, existed before what are known as "demons". Demons are simply supernatural entities that feed off mischief, much like a bully emotionally feeds off the torment of others. Angels are Entities assigned by a creator/interferer (a God) to protect a region or being. Thus, the creators (Gods) made "angels" to protect other beings. "demons" are not created by said "gods", but a bi product of creations or evolutions of previous creations. Thus, it is likely that Gods and angels speak a language more ancient than demons.