Not Necessarily.
You see, there is a GOD of worms, and a KING of Worms. Mannimarco ascended and became A God-the God of Worms. But then Akatosh's Jills went and fixed the Dragon Break, and Mannimarco got "demoted,"-The king of Worms, but The God of Worms still Remained.
So really, there are Multiple Mannimarcos.
But that still dosen't mean mannimarco (The Non-god one) isn't a lich.
And I think being a lich Meana you'd be strong enough to take down the COC.
By the way another 2 questions.
Why dosen't mannimarco try to become a god agian?
How do you become a god, apart from the heart of lorkhan(Which I doubt is actually destroyed just freed from being a pyisical entity)?
Oh and thakns for the list luagar2.