Stephen Prothero has a new book out called “God Is Not One” and his basic premise is that, contrary to both religious liberals like Karen Armstrong and committed atheists like Dakwins et al, The world’s major religions do have some fundamental differences. Each are exclusive in their own ways and yet overlap in many other areas. The strict monotheism of Judaism, Christianity and Islam is inherently exclusive among those who follow the traditional teachings of each. Are there those among each religion that this wouldn’t apply to? Of course, but they’re contradicting the basic text behind their respective tradition/religion.