Philippine Catholicism is the largest religion in the Philippines, with about 80% of the population identifying as Roman Catholic. It was introduced in the 16th century by Spanish colonizers and has since become deeply integrated into Filipino culture, influencing festivals, traditions, and daily life. The Catholic Church in the Philippines is known for its vibrant celebrations, such as the Feast of the Black Nazarene and Sinulog Festival. The country is also home to numerous historic churches, including the San Agustin Church in Manila, which is a UNESCO World Heritage Site, showcasing the rich architectural heritage of Catholicism in the region.