If Satan founded a religion, it would be Islam, because Satan deceives and oppresses; ditto for Islam.
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The statement by the writer needs modification. When God cast the Devil from his kingdom to the earthly realm, what do you think would be the natural outcome? As soon as angry and spiteful Satan arrived he set about corrupting God’s earthly creation. His hallmark has always been pure evil so it’s no surprise he would devise his own ‘religion’ and go about recruiting his own warriors to force this evil upon God’s earthly creation. Islam is that creation and with his warriors he is on a crusade to capture earth and its inhabitants.