If you are curious how this breaks down by discipline, and other issues surrounding the state of knowledge of religion among scientists check this out: http://www.owlnet.ri...oblems_54_2.pdf. The information specifically about the disciplines is on page 8/296.
Some excerpts that I found interesting anyway:
in response to the assertion "there is the most truth in one religion" 3.4% of physicists agreed, 2.6% of chemists, 1.9% of sociologists, 8.5% of political scientists and 1% of psychologists.
The number who said that they had some doubts about God but believed combined with the number who are certain that God exists: 19% of physicists, 29% of chemists, 20% of socioloigsts.
The paper also offers up some potential explanations for this.
"It is an assumption of much scholarly work that the religious beliefs of scientists are a function of their commitment to science. The findings presented here show that indeed academics in the natural and social sciences at elite research universities are less religious than many of those in the general public, at least according to traditional indicators of religiosity. Assuming, however, that becoming a scientist necessarily leads to loss of religious commitments is untenable when we take into account the differential selection of scientists from certain religious backgrounds. Our results indicate that people from certain backgrounds (thenon-religious, for example) disproportionately self-select into scientific professions. In contrast, being raised a Protestant and in a home where religion was very important, for example, leads to a greater likelihood that a scientist will remain relatively religious
Another possibility is that religious individuals might select into science graduate programs equally but that the graduate programs and scientific environments themselves have strong
anti-religious messages and reward structures, either passive or active, such that some abandon their faith in the process and others leave programs. To study the previous we would need data
not just on faculty at elite institutions but a data collection including a broader set of individuals in the academic sciences (graduate students, postdoctoral fellows, researchers, in addition to
faculty) as well as the ability to follow these same individuals over time."