There are many Christian religions in existence in our modern times. We have the responsibility to ask ourselves: is there one, true Church (or are the many various Christian churches all part of the same church?), and, if so, what is that One, True Church? There must be, of course, One, True Church, as according to 2 John 1:7-11, leaving aside correct teaching means leaving aside God. As well, if the Church were made up of all the various Christian religions, it would be very confusing to decide who to look to for guidance on various matters. Orthodoxy is that One, True Church of Christ, having a continuous succession of bishops back to the first bishops: the Apostles. These bishops have maintained the original teachings of Christ throughout the ages.
Can a head be a head to more than one body? Some have come up with a theory that the Church must refer to all the saved Christians on the earth at one time. Yet the Bible also says that the Church is the “pillar and foundation of the truth” (1 Timothy 3:15). If the Church is an invisible group of all the saved Christians, then where is there a pillar or a foundation that we can look at for guidance? This would lead to a lot of confusion, for sure. We’d have to go and ask each minister we knew, and they might give different answers.
This succession of bishops continues to this day: in the Orthodox Church. All Orthodox priests and bishops have been ordained by bishops that can be traced back to the Apostles...The Orthodox Church is the original Christian Church, which has faithfully preserved the doctrine and practices of the Early Church. In this day, many are looking to rediscover the New Testament Church, and are often surprised to learn that it has been there all along.