Indonesia is defined by its foundational philosophy of *Pancasila*, the first tenet of which requires belief in the one and only God. The state officially recognizes six religions, ensuring a diverse and generally harmonious religious landscape.
* **Islam:** Indonesia is the most populous Muslim-majority country in the world (approx. 87% of the population). The **Istiqlal Mosque** in Jakarta is the largest mosque in Southeast Asia. * **Christianity:** Protestantism and Catholicism are widely practiced, particularly in regions like North Sumatra, North Sulawesi, Papua, and East Nusa Tenggara. * **Hinduism:** Bali is the center of Indonesian Hinduism, characterized by vibrant daily offerings, temple festivals, and a distinct cultural integration. * **Buddhism & Confucianism:** Practiced largely by the Chinese Indonesian community. The **Jakarta Cathedral** stands directly across from the Istiqlal Mosque, symbolizing religious tolerance.