In 1980, missionary works started and was first done in the towns of Pampanga and then, the neighboring provinces of Bulacan, Rizal, Nueva Ecija, Bataan, and Metro Manila.
In the last quarter of 1980, the church launched the radio program Ang Dating Daan (ADD).
MCGI members prefer themselves to be called and identified as plain "Christians".
MCGI is not related to the many Church of God groups that descended from the Barney Creek Meeting House revival of the late 19th century in the United States.
On April 25, 1980, in compliance with government regulations, Eliseo Soriano registered the group with the Securities and Exchange Commission (SEC) as Ang Mga Kaanib sa Iglesia ng Dios Kay Kristo Hesus, Haligi at Saligan ng Katotohan, sa Bansang Pilipinas (English: Members of the Church of God in Christ Jesus, Pillar and Ground of Truth in the Philippines).