Gstrein was born in Innsbruck. He studied Oriental Studies, Slavic Studies and Theology in Innsbruck, Istanbul, Vienna and Paris. He graduated as a doctor phil. He was a foreign correspondent for many years in the Middle East, the Balkans and Eastern Europe, where he reported for the Neue Zürcher Zeitung and the Swiss Radio DRS. This was followed by scientific activities in Zurich and Vienna. He was also Deputy Director of the Institute G2W Faith in the 2nd World in Zurich. He was a lecturer in Ottoman History, Culture, Religion and Islamic Law at the University of Vienna Balkan Studies. He was President of the Association of Orthodox Churches in Switzerland and campaigned for Christians living, oppressed and persecuted in Islamic states. He also described the situation of Syrian Christians in the civil war.
In the run-up to the plebiscite on the minaret initiative in Switzerland in 2009, he was involved in the camp of supporters. He wanted to draw attention to the increasing Islamization since the seventies of the twentieth century, which began in Egypt, Algeria and Iran. The public impact of Islam's claim to power would now have reached Switzerland as well, which is why he supported and supported the minaret initiative in order to set a signal against "political Islamization". The minaret is usually a sign of victory and visibility for Islam. In addition, many Islamic states did not or no longer have the right to counter the construction and restoration of Christian churches. In 2010 he wrote an opinion on the unconstitutionality and particular danger of the organization Islamic Central Council Switzerland. In it he demanded their ban because it was not compatible with Swiss legal norms. Opponents of the initiative and daily newspapers like the Basler Zeitung tried to professionally disqualify him and thus discredit him. Gstrein was able to rehabilitate the majority and continue his teaching as a lecturer for Balkan studies at the University of Vienna. Gstrein is also a columnist of the Viennese Die Furche and hephaestus wien.
Volk ohne Anwalt. Die Kurdenfrage im Mittleren Osten. Laetare, Imba 1974,.
* Avukatsiz Halk Kürtler. Parsomen 2009. .
Ich scheue keine Mühe. Emil Grouard, Apostel von Athabasca. St. Gabriel, Steyler Verlag, Mödling 1977,.
** Nie szczedzil trudu, Verbinum, Warszawa 1994,, polnisch.
Unter Menschenhändlern im Sudan. Daniele Comboni. Den Sklaven ein Retter. St. Gabriel, Mödling / Steyler, St. Augustin 1978,.
Der Heilige aus der Kanone. Jean Le Vacher, Christensklave in Tunis und Algier. St. Gabriel, Mödling / Steyler, St. Augustin 1980,.
Alle meinen den einen Gott. Lesungen aus den heiligen Büchern der Weltreligionen.Verlag Herder, Freiburg im Breisgau 1981 und 1988,.
Der Karawanenkardinal. St. Gabriel, Mödling / Steyler, St. Augustin 1982,.
Das unsagbare Glück. Gebete und Hymnen aus dem Goldenen Tempel. Herder, Freiburg im Breisgau 1983 und 1986,.
Marx oder Mohammed? Arabischer Sozialismus und islamische Erneuerung.Ploetz Verlag, Freiburg im Breisgau 1983,.
300 Bastonadenhiebe für den Bischof. Güregh Zohrabian 1881–1972, armenisch-katholischer Kapuzinermissionar, St. Gabriel, Mödling / Steyler, St. Augustin 1984,.
Engelwerk oder Teufelsmacht? Hintergründe über eine Grauzone kirchlicher Aktivitäten: Neues Heil oder innerkirchliche Sekte. Edition Tau, Mattersburg / Bad Sauerbrunn 1990,.
Malta, mit Gozo und Comino. Walter, Olten 1988, ; 2. Auflage, Herder, Freiburg im Breisgau u.a 1992,.
Gnade, Kreuz und Sieg. Mutter Gabriele Bitterlich. Leben und Wirken. Mediatrix, St. Andrä Wördern / Altötting 1992,.
