Magneto and Apocalypse are also false gods in my book they've already been proven mortal on many occasions, Apocalypse was legit murdered by Rogue a couple months ago.
To be fair, it's not like gods don't die. At this point, I think Baldur might compete with Jean Grey in times he's been snuffed out. Hell, the mythological Baldur died and stayed dead, if I remember correctly.