 In particular, he has explored how religious congregations grapple with the challenges posed by increasing racial and ethnic diversity and transnational immigration, both authorized and unauthorized.Vasquez has also contributed to the field of method and theory, advancing a "non-reductive materialism" that stresses the centrality of embodiment, emplacement, practice, and material culture in the study of religion.He argues that religions are hybrid and dynamic artifacts produced by complex relations among discursive matrices, and social, neural, and ecological networks.