WI: Luzon is unconquerable to Spain

From what I heard the sacking of Tondo by Nakhoda Ragam of Bolkiah made the people of Luzon convertible to catholicism since the Bruneians stripped them of their native nobility and dynasty and tried to convert them BY force, what if the people in Luzon voluntarily converted to Islam not by force and were not convertible to christianity like the people of Mindanao? what would happen to the philippines?

I think Luzon has a better chance in fighting than Mindanao.


Note:
The Mindanaoans that did convert in OTL became Spanish speaking or Cebuano.
 
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