Guam's first Catholic church was founded by Diego Luis de San Vitores in 1670.
Blessed Diego Luis de San Vitores ( November 12 , 1627 -- April 2 , 1672 ) was a Spanish Jesuit missionary who founded the first Catholic church on the island of Guam . Guam . Guam was colonized in 1668 with settlers , like Diego Luis de San Vitores , a Catholic missionary .