The X-men have assets, mutants with the power to completely demolish key Inhuman infrastructure. They have access to gods, goddesses, a couple of hell Lords. List all the mutants and assets necessary to win the war.
First:
Warlock
Take Attilan and all their tech off the map by using the transmode virus. Use their tech against them.
Doug could rewrite all their code and make it the X-men's.
the X-men have access to two hell lords.
Magik
Guido
I am just saying if the X-men are really going to war, they could seriously wreck shop.