Indonesia's Main Religion: Islam (87%+)

Islam is the predominant religion in Indonesia, with approximately 87–88% of the 278+ million population identifying as Muslim (2020 Census: 87.02%). Indonesia has the world's largest Muslim population in absolute numbers.

Religious Composition (2020 Census)

Key Characteristics

• Madhhab: Predominantly Shafi'i Sunni
• Organizations: Nahdlatul Ulama (NU, ~90M), Muhammadiyah (~30M) — world's largest Islamic NGOs
• Syncretism: Local traditions (kejawen, adat) blended with orthodoxy
• State ideology: Pancasila (belief in One God) — not Islamic state
• Constitution: Guarantees freedom of worship (6 recognized religions)

Regional Variation

• Aceh: Special autonomy; Sharia law implemented
• Java: Syncretic "abangan" vs. "santri" (observant) spectrum
• Outer islands: Christian majorities in parts of Papua, NTT, North Sulawesi, Maluku
• Bali: 87% Hindu (unique in Muslim-majority country)

Contemporary Dynamics

• Rising conservatism (hijab, halal certification, Islamic finance)
• Pluralism debates (Ahmadiyya, Shia, indigenous faiths)
• Digital Islam: social media preachers, online fatwas, apps
• Government: MUI (Ulama Council) issues fatwas; Ministry of Religious Affairs manages Hajj, madrasas, zakat