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.
Ramento's background prior to his elevation as Supreme Bishop involved significant involvement in the Catholic Church and its commitment to social justice and human rights. His leadership roles within these organizations highlight his dedication to advocating for the marginalized and vulnerable.