A Catholic Website 
has this to say about the Apocalypse. “We cannot conclude without mentioning the theory advanced by the German scholar Vischer. He holds the Apocalypse to have been originally a purely Jewish composition, and to have been changed into a Christian work by the insertion of those sections that deal with Christian subjects. From a doctrinal point of view, we think, it cannot be objected to. There are other instances where inspired writers have availed themselves of non-canonical literature. Intrinsically considered it is not improbable. The Apocalypse abounds in passages which bear no specific Christian character but, on the contrary, show a decidedly Jewish complexion. Yet on the whole the theory is but a conjecture.”
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