Please read the entire linked article.
Now: either those who say Islam is incompatible with western liberty are right, or the Founders are right, because the Founders (who certainly knew Muslims, though very few) argued that liberty is the "natural" condition of all men given by their Creator (even if He isn't the one they happen to worship: it still doesn't change the fundamentals of the equation). So for those who continue to say that western democracy can never work with Islamic societies, they must be prepared to conclude that the Founders' most basic premise---that "all" men are endowed by their Creator with certain natural rights---is wrong.