Why not muslim, yoga, budist, etc. Because Jesus resurected from death has power over death and gave power over death to his disciples and I wouldn't be surprised if today there are some orthodox people with that power eventually on Mount Athos. Because Buda, Mohamad. Confucius and so on didn't had this power. When we speak about religion we speak about the life after death and if the people that start a religion don't have power over death, and Jesus has this power, then this is a real problem for someone that is not christian.
Why not catholic, protestant, etc and why orthodox. W eshoul ask how God will identify the right church. Is the right church the one with most members? Maybe but not always because at one time arianism would be the one with most members. Is the right church the one with more moeny? Maybe but not necesarily. Is the right church the one with most political power. Maybe but not necesarily. The right church is the one that is the most loved by God, the one with most miracles, and truly I speak with you that the orthodox church is filled with miracles:
1.Holy Light Every year, at Jerusalem , on the place Jesus resurected a Holy Light come from the above nd goes through church on the time of Orthodox prayers. I think that this happends fropm the time of Saint Peter. http://www.orthodoxphotos.com/Pascha_Holy_Light/index.shtml
God gave Orthodox Church the Holy Light Miracle.
2. Jordan waters start coming back for several minutes. When Jesus entered Jordan river, the waters started coming back. Early on the orthodox celebration of Baptismal of Jesus, the Jordan river waters start coming back.
3.Sanctified water. When water becomes sanctified the Brownian molecular movement gets changed and molecules start moving in order. There is no more Brownian movement of molecules. Sanctified water can be drinked even after 1 year.
4. saints bodies don't get corrupted over time and a lot of saints have miracles over time. Saint John the Baptist : http://www.orthodoxphotos.com/Holy_Relics/St._John_Maximovitch/index.shtml
Saint John The Wonderworker un sfant american: http://www.orthodoxphotos.com/Holy_Relics/St._John_Maximovitch/index.shtml
Miracles of Sainte after death:http://saintjohnwonderworker.org/visitors_book_2007.htm , http://www.sfantaparascheva.com/minuni.php
a lot of people are foretelling and lots of other miracles are in the orthodox world.
Becoming an orthodox is not enough, living as an orthodox is the thing that really matters.