I wouldn't describe Christianity as a source of all evils. The rise of Christianity took place at the same time as the destruction of the classical world, but Christianity was not the cause of that destruction. Actually the decline of the classical world and more precisely that of the Roman Empire was the cause of the rise of Christianity.
As to Christianity "stealing" all the stories, Christianity is hardly alone here. Judaism have incorporated a lot from Assyro-Shumerian mythology and Islam is pretty much built on the foundations of Christianity and Judaism.
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