“The primary source of the appeal of Christianity was Jesus - His incarnation, His life, His crucifixion, and His resurrection.”
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Christianity emerged from the religion of Israel. Or rather, it has as its background a persistent strain in that religion. To that strain Christians have looked back, and rightly, as the preparation in history for their faith.
In the third century after Christ the faith continued to spread.
Christianity is usually called a religion. As a religion it has had a wider geographic spread and is more deeply rooted among more peoples than any other religion in the history of mankind.
The history of Christianity, therefore, must be of concern to all who are interested in the record of man and particularly to all who seek to understand the contemporary human scene.