The Christian Faith is a gift of Christ offered to all humankind for the life of the world and its salvation. The Faith is not just the truths given by Christ, but rather the gift of common trust in Christ who is the Truth and lives in His Church among the Faithful in the Mysteries of Grace, that is to say, the sacramental life of the Church. All of the life of the Church, including prayer and loving acts toward others in the name of the Lord, is sacramental and grace-filled. This Faith was delivered by Christ to the Apostles, and passed down to all subsequent generations by Apostolic Succession within the Body of Christ. The Christian Faith in its fulness is also called the Orthodox Faith, because it is lived and expressed in right worship, and presents sound doctrine. Right worship is the service of God practiced in His Church according to His ordinances.
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After reading these, you may be interested in reading the following series of four books on the Christian Orthodox Faith:
History of Orthodox Christianity:
*Note, the audio readings above are provided by Ancient Faith Radio and provides readings based on the Revised Orthodox Julian Calendar, because a majority of Orthodox jurisdictions are on the Revised Julian Calendar, as are the large majority of Orthodox in America. While most of the year the daily readings are the same for the Julian and Revised Julian Calendar, there is a portion of the calendar where they differ. For this reason, we here provide the readings for days when they differ.
The above audio readings are provided by AFR and are based on the Orthodox Revised Julian Calendar because a majority of Orthodox jurisdictions (and the largest three in the US) follow the RJC. There are no audio readings based on the old Julian reckoning of the Menaion.
The Orthodox Calendars (both Julian and Revised Julian) are both the same with regard to the Octoechos, the Lenten Triodion, the Pentecostorian (Flowery Triodion). The only difference is that observation of the Menaion (currently 13 days apart) and "shifts" that occur with regard to the Menaion (such as Lucan jump, and when major feasts fall on a particular day).