Gabriel Fomin was born in 1882 in the village of Ivachevo, Zарайsk District, into the family of the peasant Khariton Fomin. From an early age, he assisted in the church. In 1925–1926, he moved to the village of Gorodets, where he served at the Church of Saint Nicholas.
In 1932, he was arrested and sentenced to three years of imprisonment. After his release, he settled in the village of Sushkovo, where he continued to assist the parish priest. On 7 September 1938, he was arrested again and accused of spreading counter-revolutionary propaganda.
Despite the false charges and the pressure brought against him, he remained steadfast with courage and faith. On 16 August 1939, he was sentenced to five years of imprisonment in a forced labor camp.
He reposed on 22 April 1942 in the Unzhensky Corrective Labor Camp and was buried in an unmarked grave.
