It's not a book bashing Islam, but one explaining it and compares Islam to Christianity.
Remember when John Ashcroft said Allah wants his followers to shed blood for him and Jesus shed his blood for us. There was such an upraor but that is exactly what the difference is.
FYI...Unveiling Islam (Islamic Texts Society)
by T.J. Winter (Translator),
Robert Du Pasquier, Robert DupasquierPublisher: Islamic Texts Society;
ASIN: 0946621322;
Reissue edition (January 1992)