Islam in SEA spread due to proselytization and trade and its importance in SEA economies, and not by foreign conquest and forced conversion.
I guess it spread peacefully … the British on the other hand …
Spread rubber, tea, and contracts wherever we went. I’d guess the Malaysians and Singaporeans are happy for the global leg-up caused by having English integrated into their education systems. And for the roads. And the sanitation. And the public health. And the aqueduct.