“Religiously the Empire was pluralistic and marked by a search for a faith which would be satisfying intellectually and ethically and would give assurance of immortality.”
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The primary source of the appeal of Christianity was Jesus - His incarnation, His life, His crucifixion, and His resurrection.
In the third century after Christ the faith continued to spread.
That free will was demonstrated in the placing of temptation before man with the command not to eat of the fruit of the tree which would give him a knowledge of good and evil, with the disturbing moral conflict to which that awareness would give rise.
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.