In 1995 he received excellent mark for his thesis on “The Commendatory and Theology of Khosrov of Andzrev on Daily Prayers of our Church.” The same year the Catholicos of All Armenians, Karekin I, ordained Vazgen a celibate priest, in the name of Archbishop Bagrat Vardazarian, who had been martyred in 1937 repressions.

[citation needed] In 1995, while holding the position as director of Saint Gregory the Illuminator Sunday school in Holy Etchmiadzin, Bishop Bagrat was appointed as vice-president of the newly established Centre of Christian Education and Preaching.

[citation needed] From 1996 to 1998 Bishop Bagrat assisted Karekin I as secretary in his pontifical visits to South America, Moscow, the U.K., and Austria.

[citation needed] While at the Seminary, Bishop Bagrat introduced the subject of “Green Theology” for the first time in Eastern European and the former Soviet Republic and its churches.

[citation needed] In 2002 he received the rank of Vardapet for his thesis on “The Problem of the Sacrament of anointing the sick in the Armenian Church.” At this time Bagrat was appointed head of the newly founded department of Media, Relations and Communications of Mother See of Holy Etchmiadzin.

Bagrat Galstanyan has published numerous articles on theology, social, cultural spheres concerning Armenia, and the Armenian Church.

17 monasteries and churches with their adjacent lands were re-obtained from the government in Ashtarak, Aparan and Talin which historically belonged to the Mother See, but were annexed by the previous Soviet regime.

[11] He attended studies at the College of the Resurrection at Mirfield, at the same time assuming the position of visiting priest of Manchester’s Holy Trinity Armenian Church, until the year 2000.

[citation needed] On 26 May 2024, the "Tavush for the Homeland" movement spearheaded by Galstanyan held a rally attended by tens of thousands of supporters who along with the Archbishop demanded the resignation of Prime Minister Nikol Pashinyan and his government[18] after the Armenian government unilaterally agreed to return to Azerbaijan four villages in the Qazakh District near the Tavush Province which were captured by Armenia during the First Nagorno-Karabakh war[19] under the border delimitation process between the two countries.