Orthodoxy isnt more resistant than Catholicism, its just decentralized. Some branches of Orthodoxy have been completely subverted by the state, while others are still independent. Catholicism is centralized, but there is only so much subversives can accomplish without pissing of the wrong people.

Orthodoxy isnt more resistant than Catholicism, its just decentralized. Some branches of Orthodoxy have been completely subverted by the state.