This article, http://www.worldnetdaily.com/news/article.asp?ARTICLE_ID=24851 suggests the number is 10% to 20%.
I rather suspect that this number derives from the percentage of muslims that are Shi’a (I believe this the sect to which the Taliban belong.) This site, which appears to be maintained by Muslims, has as the answer to a quiz question that 15% of Muslims are Shi’a.
I am guessing that it is unfair to impugn the entire sect. Does anyone know of any polls that assess political attitudes of Muslims?
Thanks,
Tinker