"Those 'holy lands' the so-called saviors of the continent only acted when those invaders had made significant inroads to the continent.
Yes, back then countless sects, clans, empires, kingdoms, and other factions had fallen to each other's hands, but others had fallen to the invaders who destroyed them root and stem while pillaging them.
Countless legacies missing today are in their hands. The two holy lands only stepped in when the other big players of those continents walked in and set their sights on them, but by that time, the damage done by those invaders was already extensive, and the little scuffle after between the holy land and them, only added to it.