The answer
To be a member of the Orthodox Church, we need to ask ourselves: Who is the Church? The Church is a group of people who believe in their communion with God the Father, in Jesus Christ the incarnate Word of God, by His Holy Spirit. This is how we conceive of redemption, membership in the church, a deep understanding of the Holy Bible, an acceptance of the Kingdom of God within our souls, a communion with the saints and the angels, and the experience of eternal life.In the Old Testament, the children of Abraham had the covenant of circumcision with God (Gen 17). In the New Testament Christ offered a new covenant, His Body and Blood, on the cross presenting them as the Eucharist to His people, the Church.
To be a member in the Orthodox Church, you have to be baptized, and partake in the Holy Mysteries of the Church. Any faithful member can serve in the Church.
The Coptic Orthodox Church doesn't ask anyone for specific dues. Members give their tithes and their donations to Church willingly not only because it is mentioned in the Holy Bible, but because of all the blessings that come with it. You can read more about this in the article titled, "The Virtue of Giving": http://www.suscopts.org/literature/literature.php?misc=search&subaction=showfull&id=1102863028&archive=&cnshow=news&start_from=&.
Answered by His Eminence Metropolitan Youssef (opens in a new tab)