There is another author with a similar theory that looks more scholarly to me:
Karl-Heinz Ohlig has written several books. Here is one "Early Islam: A Critical Reconstruction Based on Contemporary Sources"
http://books.google.com/books/about/Earl...l_mwEACAAJ
Here is the wikipedia about the author:
http://en.wikipedia.org/wiki/Karl-Heinz_Ohlig
Karl-Heinz Ohlig has written several books. Here is one "Early Islam: A Critical Reconstruction Based on Contemporary Sources"
http://books.google.com/books/about/Earl...l_mwEACAAJ
Here is the wikipedia about the author:
http://en.wikipedia.org/wiki/Karl-Heinz_Ohlig