This is some of the same logic that made the Sunfire damage spell in the Restoration school. How can something that does damage not be a Destruction spell? Seems kind of dumb to me.
But spells like Smite or something, "Holy" magic would be restoration, but they generally have an effect.
Such as Smite, "Generate a flash of light if nearby undead are around 5 damage"
or even
Holy Heal "Heal yourself 10 pts, but damage undead health 10pts undead"