NeoSartania never needed other realms to be religious in order to start crusades against them . . . why do you think Morgan is somewhat wary of Sorriane being a theocracy of Sartania?
NeoSartania started exactly one war - and that was only with the very, very heavy prompting and pushing of Thain and C'thonia. Unfortunately it sort of backfired when C'thonia decided that a better prospect than allying with NS as promised would be to stab them in the back and steal their lands instead.