Prior to his election as Supreme Bishop, Ramento was the Diocesan Bishop of Cavite from 1970 to 1993. He was co-chair of the Ecumenical Bishops' Forum, chaired the Promotion of Church People's Response–Central Luzon and human rights group Karapatan–Tarlac, and chaired other various church and cause-oriented organizations. He was an ardent supporter of the Hacienda Luisita strikers.
Prior to his appointment as Supreme Bishop, Ramento held leadership positions within the Catholic Church, specifically focusing on social justice and human rights advocacy. He was a prominent figure in various church organizations, including the Ecumenical Bishops' Forum and Karapatan–Tarlac.