Yeah, because I'm counting quite a few. Would be cool to see us list all of them, here, to lay out what parts of X-men are not actually about Mutants in one form or another, as such:
Stan and Jack:
The Savage Land
The Stranger
The Z'nox
Juggernaut (Cyttorrak, Crimson Cosmos)
The Quists (humanoid aliens ruled by the Super-computer Dominus - Dominex, Lucifer)
Claremont:
The Sh'Iar (Gladiator, the Imperial Guard)
The Phoenix Force (well, I suppose this one is arguable... but Claremont himself said in Excalibur that SORCERORS can wield it as well)
Mojoverse
The Technarch
Limbo (Soulsword, Belasco, S'ym, Elder-gods)
Brood
Sidri (Sidrian Hunters - intelligent alien insectoids)
N'Garai (demon-spawn of the elder-god Chthon, resides in parallel hell-like dimension)
R'utai (demonic former slave-race of the N'Garai, Pilgrim is a member of their species)
The Siege Perilous (mystical mirror and door-way, alters the very fate of those who walk through it)
Everybody else:
Krakatoa (sentient eco-system)
Sublime (sentient primal bacterial colony)
Trion & their Realm (mystical extra-dimensional principalities - beings that are neither gods nor demons, similar to Cytorrak, Ejulp is an inhabitant for instance.)
The Phalanx
Breakworld (Ord, Powerlord Kruun)