Disclaimer; I honestly know jack on religious believes of what is now Philipines beyond the southern muslims. So...
The philipinians had been conquered and colonised by Spain, and converted to catholicism. Add this later the USA and possibly Protestants conversions I guess...
But let's think. Nationalism.
How come there never was a certain nostalgia for 'freer days' - and so, how would come a 'nationalist revival' hostile to colonial past(s), and a certain return to indigenous believes, perhaps 'reconstructed' into a sort of Philipinian Neo'paganism', come to be?
Or perhaps a return to 'malayfied hinduism' or buddhism, or even islam...