I was thinking if Majapahit accepts Islam and its core accepts Islam, I think these will be the consequences
-Luzon accepts Islam voluntarily - since it is allied with Majapahit, not like what happened in OTL where in it was forced upon, them, they will use their religions Paganism and Islam as a rallying point against the Spanish like Mindanao did making the Spanish hold in the philippines harder than OTL, the Visayans' life will be harder because the Luzonians also treat the Visayans as source of Slaves so more slave raiding there.
-An Islamisation of Bali and the other areas that remained Animist and Hindu that were parts of Majapahit will be Islamic.
-Luzon accepts Islam voluntarily - since it is allied with Majapahit, not like what happened in OTL where in it was forced upon, them, they will use their religions Paganism and Islam as a rallying point against the Spanish like Mindanao did making the Spanish hold in the philippines harder than OTL, the Visayans' life will be harder because the Luzonians also treat the Visayans as source of Slaves so more slave raiding there.
-An Islamisation of Bali and the other areas that remained Animist and Hindu that were parts of Majapahit will be Islamic.