Faith is important to many people, and the polls of religious belief by Ipsos MORI and the Tony Blair Faith Foundation offer useful statistics about its importance (“Unequal Zeal,” July 9, 2011). As you report, ninety-four percent of people in Saudi Arabia, Turkey, and Indonesia, all of which are mainly Muslim countries, say that religion is important in their lives. By comparison, in Sweden and France only forty-two and thirty-six percent of Christians deem faith important. This supports your hypothesis that the fault-line between Islam and Christianity may have to do with the lack of any religion in the lives of many Europeans. But it is obviously quite different in the United States, where eighty-six percent of Christians say that religion is important in their lives. They are lagging behind the Muslims in Saudi Arabia, Turkey, and Indonesia by no more than eight percentage points. This supports the alternative hypothesis that the fault-line between Islam and Christianity is indeed about two rival religions. Given that America is quite “active” in its foreign policy across the globe, this is rather worrying. The fault-line seems to be getting deeper by the day.