There is strong evidence that religion is resurging among students on America's top university campuses. Yet, a large number of academic scientists firmly feel that they should not discuss religion in their classrooms. I have spent the last five years surveying nearly 1,700 natural and social scientists working at elite U.S. universities -- talking with 275 of them in-depth -- in an effort to understand their religious beliefs and practices, or lack thereof. As I traveled the country, I asked scientists about the role of religion within the university. Many scientists believe that religion has no legitimate place in the modern American academy; 54 percent mentioned the dangers that religion could bring to universities (and in particular to science) when it goes wrong. About 36 percent of scientists I talked with said they have a model of university life that does not allow any positive role for religious people, institutions and ideas. And they have few models for how scientists (with or without faith) might sustain productive interaction with or respond to religious people and ideas. In their models of the university, such people and ideas exist primarily as a threat to science.