A student of Albert Schweitzer and Martin Werner, he attempted to demonstrate the textual link between pre-Islamic Christian hymnody in the Middle East to the composition of the Qur'an.
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German Islam expert Tilman Nagel acknowledged in a 2008 interview these views as a mainstream theory by observing that "(Western Islam research) has moved towards the other extreme: since the late 1970s you hear that 'the historic figure Mohammed is a fiction, the Qur'an was written and changed during centuries by anonymous writers'. Some Islam experts even believe that the first Muslim community was a Christian Syriac sect".
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