The Orthodox Church, by Bishop Kallistos Ware, is the de facto standard for Church introductions as far as I know. It is on the web at:
Part 1: Church History
http://www.synaxis.org/sschool/Orthodox_Church.html
Part 2: Faith and Worship
http://www.synaxis.org/sschool/Orthodox_Church_Worship.html
Part 1: Church History
http://www.synaxis.org/sschool/Orthodox_Church.html
Part 2: Faith and Worship
http://www.synaxis.org/sschool/Orthodox_Church_Worship.html
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