The Protestants alone are able to attack the Koran with success; and for them, I trust, Providence has reserved the glory of its overthrow.
...for how criminal soever Mohammed may have been in imposing a false religion on mankind...
The Qur'an of course, borrows liberally from the stories of the Bible and indeed contains many common sense truths of its own; thus the cover page itself quotes St. Augustine, "Nulla falsa doctrina est quae non aliquid veri permisceat," that is, “There is no false doctrine that does not contain some truth.”
So the front page of the very "Jefferson Qur'an" these folks are swearing upon calls its contents "false doctrine" mixed with some truth. The irony is complete. And so it goes also in our current world of "news": We may get the truth, but seldom the whole truth.
Full text here, courtesy of Gutenberg.org.