Adventino Casido was born 1969 in Bais City, the Philippines. He was educated at Bais City High School before undergoing theological training at Metro Manila Theological Seminary and the International Grace Bible Institute of Lupagan. He then entered the ministry for a number of years.
He then studyied at Genaro Goñi Memorial College and obtained a Bachelor of Science degree in Secondary Education with a major in Mathematics, after which he became an instructor at Negros Oriental State University for a number of years. He now lives in Bayawan City in the Philippines.