Of course you don't agree and that's because you consistently fail to understand what warlocks are about. You know, babies and even the godlike titans aren't born with demonic knowledge and mastery over fel demons and their fel magics. So you shouldn't expect me to believe that warlocks themselves are masters of fel demons and their demonic fel magics. If anything, eredar warlocks are priests who serve Sargeras as leaders who lead his demonic acolytes with rituals in which demons are summoned and controlled. If anything, satyr warlocks - despite being masters of fel magic - serve Sargeras as leaders who command an army of demonic acolytes.
Fel magic is the magic of a fel army of fel demons from an astral dimension that transcends all realities. If Elune can't control and/or restrict the usage of fel meteors from the astral Nether despite being the astral goddess of the moon, you can't expect me to believe warlocks are the masters of fel meteors and fel magics. Demonologists must be ultra gods if they can rain brimstone and fire from the heavens.
You see, you would act as if Sargeras isn't the God of Fel or act as if the fel demons that serve Sargeras aren't gods (even though they do indeed have the requirement to be considered gods), but then act as if warlocks can wield fel magic just fine without being servants of a "higher" power.
Oh Aucard....don't you know that Blizzard deals with timey wimey nonsense? Sargeras
could have transformed into a walking contradiction when this titan became infused with fel magic - the opposite magic of the titans' arcane magic - and created an army that oppose the very thing that he - as a titan - represented. Sargeras could have transcended reality when he went to the Nether, essentially becoming some unreal god that no longer exists in reality, then boom boom pow created a fel army of demons and their fel magic.
Warlocks tap into the fel magic of fel meteors that rain from the heavens. Their fel magic ultimately exists because of the divine Light and Void, which ultimately means the divine Light and Void are - or have - something integral to (or a part of) fel magic. Fel magic is technically divine, used by the fel priestesses of Sargeras who yap about the destiny of all mortals.
Tell me more about how warlocks can wield a technically divine magic resulting from the divine Light and Void without being diviners who divine information from the God of Fel and Flame. You know the outstanding trait of warlocks is their fel vision into the future or their ability to "command" all-seeing observers from an astral dimension that transcends all realities.
Also:
http://wow.gamepedia.com/Felsworn_Soulpriest
^There is your orc priest