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Harnack's work is considered by many experts to be unsurpassed. His approach is not meant to prove any set of dogmatic beliefs, but is one of objectivity. His factual approach is not colored by the bias of trying convert readers to the faith. He states that this is simply an historical approach to the question, What is Christianity?

What Is Christianity? 2016, Wentworth Press

ISBN-13: 9781371693138

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What Is Christianity? 2015, Andesite Press

ISBN-13: 9781298491145

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What Is Christianity? 2012, Hardpress Publishing, Ann Arbor MI

ISBN-13: 9781290236973

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What Is Christianity? 2011, Martino Fine Books

ISBN-13: 9781614270164

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What Is Christianity 2011, Createspace Independent Publishing Platform

ISBN-13: 9781463564551

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What Is Christianity? 2010, Nabu Press, Charleston SC

ISBN-13: 9781177095099

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What Is Christianity? 2006, Book Tree, San Diego, CA

ISBN-13: 9781585092727

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What Is Christianity? 1958, Peter Smith Publisher

ISBN-13: 9780844622088

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What is Christianity? Joanna Cotler Books

ISBN-13: 9780061300172

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