Actually, Geller does NOT have extensive knowledge of this subject. She just spews her hate and relies on Spencer to fill in some details.
How the hell do YOU know ? Do you have even a modicum of knowledge of Islamization, to be able to judge somebody who has written 3 books on the subject, and is the founder, editor, and publisher of AtlasShrugs.com. She is also the executive director of Stop Islamization of America (SIOA), as well as the Freedom Defense Initiative (FDI), and is a regular columnist for the American Thinker, Human Events, and other publications.
And you ? Your qualifications to judge her are ? I wonder if quizzed, if you could answer who 10% of the people are, that she talks about in her books. Pamela Geller has done a lot of research and work in this subject. Have you ?