The assumption seems to be that muslims born, brought up and living in Europe would have the exact same birthrate as if their ancestors who lived in a very diff

The assumption seems to be that muslims born, brought up and living in Europe would have the exact same birthrate as if their ancestors who lived in a very different society at a different time. For that matter, birthrates are plummeting in many developing countries including the middle eastern ones - this is generally not acknowledged in these kind of projections.