Carolyn Brewer's study of the encounter between Spanish colonization and Philippine shamanism documents how colonial friars quickly identified the babaylan as their principal rivals for religious authority in the communities they hoped to convert, since a rival intermediary already existed who could claim exactly the sacred standing Catholic priests wished to occupy. Missionary writing recast babaylan from respected community leaders into witches and devil worshippers, and their asog counterparts into figures of moral and sexual suspicion, a rhetorical strategy that served the practical goal of discrediting indigenous religious authority in favor of the church's own.
The formal office did not survive Spanish colonization intact, though elements of babaylan practice persisted within folk healing traditions, local spirit mediumship, and resistance movements that periodically invoked babaylan authority against colonial rule well into the Spanish and later American colonial periods. Direct institutional continuity from the precolonial office to any single present day practice cannot be claimed with confidence, and this atlas does not assert one.
A self conscious babaylan revival movement exists today, most visible among the Filipino diaspora and within indigenous rights and feminist organizing in the Philippines, reclaiming the babaylan as a symbol of precolonial spiritual authority and gender complexity largely erased by colonial religion. This atlas describes that revival as a modern reclamation project built on historical memory, distinct from a claim of unbroken practice, and treats the babaylan's ritual content, where any is taught within the revival, as belonging to living communities to describe rather than for this atlas to instruct.