Sociology of religion is the study of the beliefs, practices and organizational forms of religion using the tools and methods of the discipline of sociology. This objective investigation may include the use of both quantitative methods (surveys, polls, demographic and census analysis) and qualitative approaches such as participant observation, interviewing, and analysis of archival, historical and documentary materials. Modern academic sociology began with the analysis of religion in Émile Durkheim's 1897 study of suicide rates among Catholic and Protestant populations, a foundational work of social research which served to distinguish sociology from other disciplines, such as psychology. The works of Karl Marx and Max Weber emphasized the relationship between religion and the economic or social structure of society. Contemporary debates have centered on issues such as secularization, civil religion, and the cohesiveness of religion in the context of globalization and multiculturalism. The contemporary sociology of religion may also encompass the sociology of irreligion (for instance, in the analysis of secular humanist belief systems). Sociology of religion is distinguished from the philosophy of religion in that it does not set out to assess the validity of religious beliefs. The process of comparing multiple conflicting dogmas may require what Peter L. Berger has described as inherent "methodological atheism". Whereas the sociology of religion broadly differs from theology in assuming indifference to the supernatural, theorists tend to acknowledge socio-cultural reification of religious practice.