Not quite true, or at least not so baldly. Job describes the "satan", or accuser, in a manner that clearly anticipates his later depiction as "the accuser of the brethren" in Revelation. And while not providing a name, the descriptions of the mythical falls of the kings of Babylon and Tyre in Isaiah and Ezekiel seem to draw on legends similar to the later Christian elaboration of the story of demonic rebellion and exile.