What occurred in the Philippines that caused Japanese to become concerned about spanish missionaries japan?

In the Philippines, the rapid conversion of the native population to Christianity by Spanish missionaries, particularly the arrival of the Jesuits, alarmed Japan. The Tokugawa shogunate, fearful of the influence of Christianity and foreign powers, responded by closing Japan's borders and initiating a severe persecution of Christians. Believing that Christianity could undermine their authority and threaten the stability of the country, they issued a series of edicts proscribing the practice of Christianity.