The religions of pre-Indo-European Europe are a large and difficult subject; but a sufficiently wide survey turns out to be less complicated than might seem possible. For full perspective, however, account has to be taken both of Western Asia and of Northern Africa as far as the Guinea Coast and Ethiopia. On the other hand, Indo-European peoples have intruded so far, and also have in turn been overlaid so deeply that it is not always easy to recognize Indo-European survivals at all; wide regions have been stripped—by Islam especially—not only of Indo-European but of the earlier cultures as well.