Gods can be (Insert Here)

They were Human in G3? Don't remember that. But yes. Since any mortal can become a god, there is a possibility that current ingame gods were originally mortal. In one G15's scenes, it shows a picture of teenage Morrighan and Cichol without wings.

http://mabidata.net/forum/viewtopic.php?f=20&t=829

Edit: If you are referring to

“	In Generation 3, Morrighan refers Cichol as a 'cold and heartless Human being.'	„

Then that is irrelevant. Groups of People is what I called them rather than race because they aren't races. One can be a Milletian and not human. One can be a Fomor and not Gremlin. Etc. If God is really the same type of thing, then their species is irrelevant. The word Mortal ingame refers to someone who can die, not someone who is Human.