Religiosity has been under attack worldwide for centuries, this is not exclusive to christianity. The Islamic world is undergoing a massive secularization under the surface. East Asia is essentialy atheistic at this point. The lure of hedonism and the "liberation" from responsability and commitment it provides is simply too great.

The only religious groups that are thriving are the ones that explicitly forbid most of the contact with the modern world and force members to practice endogamy and isolationism. Ultra Orthodox Jews and Old Order Mennonites come to mind. I think hardcore isolationism is the only way forward for groups that wish to uphold tradition. The Eastern European model is unsustainable exactly because of its incessant contact with and dependency on the west. Long term, not even Russia will be able to resist if it doesn't radicalize.