Islam in SouthEast Asia?

Simply question. Why did Islam take off in Indonesia, but fail to penetrate into the wider Burma-Thai-Viet peninsula of SE Asia?
 
From Wikipedia:

"There are several theories to the Islamizationprocess in Southeast Asia. The first theory is trade. The expansion of trade among West Asia, India and Southeast Asia helped the spread of the religion as Muslim traders brought Islam to the region. The second theory is the role of missionaries or Sufis. The Sufi missionaries played a significant role in spreading the faith by syncretising Islamic ideas with existing local beliefs and religious notions. Finally, the ruling classes embraced Islam which further aided the permeation of the religion throughout the region. The ruler of the region's most important port, Malacca Sultanate, embraced Islam, heralding a period of accelerated conversion of Islam throughout the region as the religion provided a unifying force among the ruling and trading classes near mister man. The word daulat refers to the legitimacy of a ruler, through the power of God, and suggests the strong relationship between rule, legitimacy, and the spread of Islam.[12]

The spread of Islam to Southeast Asia also depended largely on the translation and availability of religious texts. This was largely through Malay, a language that transected class.[10] There are also a number of works in Javanese, particularly related to Javanese-Islamic mysticism.[13] Some of the most significant Malay authors that helped in this translation are Hamzah Fansuri, Shams al-Din, and 'Abd al-Ra-uf.[9]"

So a combo of trade routes, missionaries using the Malay languages, and, most importantly, the local rulers converting.
 
Simply question. Why did Islam take off in Indonesia, but fail to penetrate into the wider Burma-Thai-Viet peninsula of SE Asia?

Correction: Islam did penetrate the Indianized Hindu-Buddhist Champa kingdom in southern Vietnam, but then Champa was conquered by the Sinicized kingdom of Vietnam.
 
See this post in /r/AskHistorians. Basically, in mainland Southeast Asia organized religion (mostly Theravada Buddhism by this point) was more entrenched than Hindu-Buddhism had been in Indonesia.
 
I was told
Majapahit is Hindu-Animist
the Hindu gods got merged with the local pantheon of each area or localized which means local flavors of Hinduism or Hindu flavored Folk religion.
Sri Vijaya is Primarily Buddhist
 
My opinion is generally that Muslim merchant communities eventually formed into states which then waged physical jihad upon the kingdoms of Java. Most notably, the Sultanate of Demak, which began as migrants to Java and eventually formed into a state that enforced itself upon the rest of Java. Subsequent Muslim states would invade Sunda and complete the process.
 
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