secularisation

noun3

1. •
   The transformation of a society from close identification with religious values and institutions toward non-religious (or "irreligious") values and secular institutions.
2. •
   The deconsecration of a church.
3. •
   The act of becoming secular.

   • Wojtyla and Mazowiecki come from the same Krakow intellectual circles that advocated the secularization of politics and led the recent efforts for Polish-Jewish dialogue. — 1989