New Alliance Race Speculation thickens!

[JustAGuy]

...Later they tought humans about magic so humans tap into the same demonic powers the elves do. Dalaran was built on a node of this demonic/arcane power and just from the dalaran mages' use of it demons were able to enter the world and had to be hunted down. Human and elf magic are 1 in the same and both come from a demonic source.
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You are describing only one aspect of humanity's control of magic. This is separate from "The Light™", one of the few different types of magic humans have been known to wield; Demonic, Arcane, and Holy, to be precise.

The elves may have taught humans to use magic, but it doesn't all come from the same source. Only the warlocks use demonic magic. Paladins derive their magic from a divine source. If all human magic was the same, then there would be Dwarf Warlocks running around, seeing as they are capable of using Paladin magic.

You are correct in that there's no strict definition of what "Holy" magic is. All we know is that it's divine and is related to some sort of religious spirituality. It is clear, though, that it is not of the same source as demonic magic.