The major religion in Indonesia, Malaysia, and the Philippines is Islam, while Thailand has a significant Buddhist population. Here’s a brief overview:
- Indonesia: Predominantly Islamic (largest Muslim-majority country).
- Malaysia: Primarily Islamic (official religion).
- Philippines: Mainly Christian (with a significant Muslim minority).
- Thailand: Predominantly Buddhist.
So, the answer to your question considering Indonesia, Malaysia, and the Philippines would be Islam (option 3), but Thailand primarily features Buddhism (option 1).