Born on March 11, 1962, Very Rev. Fr Thomas Cherian, also known as Achan Kunju, was the only son of the late P. T. Cherian(Puthenpurackal Thekkepuraykkal branch) and Thakamma Cherian(Kuzhivelil, Kizhvaypore), one of their seven children. Thomas Cherian completed his primary education and graduated with a degree in History from the University of Kerala in 1987. Then, with the permission of his family member and parish Metropolitan, Kuriakose Mar Koorilos Thirumeni, he studied the Syriac language and sacraments at Malekurish Dayara and subsequently at Mulanthuruthy Vettikkal Seminary. On November 2, 1988, he was ordained as a deacon (Kooroyo) at his home parish of Mepral St. John Jacobite Church by His Eminence Kuriakose Mar Koorilos, Metropolitan of Kollam-Niranam-Thumbaman bhadrasanam.
Thomas Cherian, who excelled in his studies, joined the Bishops' College, Calcutta, in 1991 and began his graduate studies in theology. In 1994, he obtained his Bachelor of Divinity degree. On February 2, 1994, at the Moovatupuzha Catholicate Aramana Chapel, he was ordained a full deacon (M’Shamshono) by His Eminence Metropolitan Zachariah Mor Nicholovos, Metropolitan of the American Archdiocese and a family member.
On July 20, 1994, at St. Ignatius Jacobite Syrian Church, Erumely, he received the sacrament of Holy Orders and was ordained a priest (Kaseeso) by His Eminence Kuriakose Mar Koorilos Thirumeni.
He served as a vicar at many churches, including Mor Ignatius Jacobite Syrian Church, Ayroor; St. Peter's Cathedral, Thiruvananthapuram; St. Stephen's Syrian Orthodox Church, Abu Dhabi; St. George Jacobite Syrian Orthodox Simhasana Church, Al Ain, U.A.E.; and several other churches in the Niranam Bhadrasanam, including Kavumbhagam, Chennithallai, Mepral, Anjilithanam, Kunnanthanam, Puramattam, Mazhuvangad, Parangal, and Kallupara.
He also served as the Niranam Bhadrasana Secretary, a member of the Malankara Jacobite Syrian Christian Church Managing Committee, a Bhadrasana Council member, and the Director of Bhadrasana Sunday School. He was a source of inspiration and guidance to the Niranam Bhadrasanam during a very difficult period in the history of the church. In recognition of his various services, on March 18, 2023, H.G. Geevarghese Mar Coorilos Metropolitan, the head of the Niranam Bhadhrasanam, elevated him to the rank of Corepiscopa at St. George's Cathedral, Kavumbhagom. He was revered as a priest who cherished the beautiful traditional style of worship and for his steadfast conviction to the Jacobite Syrian Church. He passed away on December 21, 2023.