Orthodox Christians normally celebrate the Divine Liturgy of St. John Chrysostom, written in the 5th century.
Mass is the name of the Sunday service for Catholics and Orthodox Christians.
Greek Orthodox
Constantinople, was the political capital of the Byzantine Empire. It was also the religious center being the see of the Orthodox Patriarch of Constantinople.
Orthodox is the religious or political views of a person conforming to what is traditionally accepted. Orthodox means conventional, mainstream and conservative.
Iconostasis translates into Icon Screen. Most Orthodox households have some sort of Iconostasis where the family places icons, incense, and other religious items. Iconostasis is also the name for the icons in front of the altar in an Orthodox Church.
Serbian Orthodox
Christian Orthodox.
Armenian Orthodox
same religious holidays for Orthodox Christians.
Yes, non-Jews attend Orthodox synagogue services all the time, usually as an invited guest to an event. If you wish to attend a religious service at an Orthodox synagogue, you might want to contact the synagogue's rabbi first to determine the best time to attend. As for being circumcised or not, it doesn't make a difference as male circumcision is only a concern for Jewish males. As non-Jewish person can't participate in a Jewish religious service anyway, being uncircumcised is a moot point.
No, Orthodox don't say vows at a wedding service. The marriage is not seen as a contract, but the grace of God joining the Bride and Groom into one person united with God. You can find a good explanation of the service on the following site: http://www.saintnicholas-hamilton.org/religious/holy%20matrimony.html
Orthodox Christianity