Human Factions: Ardent Mages, Broken Lords are strongly implied to have originally been human, Forgotten, Mezari (it's especially bad here because the Mezari are just a reskin of the Vaulters), Roving Clans and Vaulters. Count: 6
Nonhuman Factions: Allayi, Cultists most of the time, Drakken, Morgawr, Necrophages and Wild Walkers, even though they are still too close for comfort. Count: 6 for a 50/50 division.
This seems relatively fine, until we get into the minor factions of the game:
Human: Dorgeshi and the Sisters of Mercy. That's literally it. Count: 2.
Nonhuman: Bos, Ceretan, Delvers, Erycis, Eyeless Ones, Formorians, Gauran, Geldirus, Haunts, Hurnas, Jotus, Kazanji, Nidya, Silics and Urces. **Count: 15.**