Jaseng D. Marak believes that God has called him while he was attending a Vacation Bible School held in the month of October 1995 during the holiday. Later on, he dedicated his life to God and committed himself to full-time ministry. In 1996, Jaseng had admitted to A·chik Theological College (ATC, Tura, West Garo Hills for a Certificate in Theology (C.Th). He completed his first theological studies in 1999. The same year, he joined the pastoral ministry in the month of June at Rajasimla Church. Rev. K.C. Marak ordained him, the Former General Secretary of Garo Baptist Convention, Tura, during the Annual Conference of Rajasimla Church, held from January 8-11, 2009. He pursued other theological degrees: Bachelor of Theology (B.Th) at ATC, Tura, and Master of Arts in Pastoral Ministry at Clark Theological College, Mokokchung, Nagaland.
God blessed him with two girls–Jakgrime and Cherime. Jakgrime finished her 10+2 standards and recently got admission for a B.A. degree; Cherime is doing her 8th standard.