Why does religion continue to emerge as a flashpoint in the age of secularization? Although models of religious resurgence suggest that religious cleavages are more prominent in the modern era, other models continue to show declining religious involvement. What is needed is a theory that can observe both resurgence and secularization at the same time. I argue that globalization—and the flow of people across borders, in particular—provokes a religious backlash at the societal level due to its secularizing effects. As the public is exposed to new and diverse religious traditions, religiosity declines; as a result, however, religious practitioners become more aggressive toward other religious groups. I test this theory using data on globalization, religious discrimination, and religious practice. I find that types of globalization dealing with the flow of people and information across borders have an outsize effect on societal religious discrimination, or SRD. This effect, however, is contingent on a decline in religious practice. This study suggests that religious resurgence can take place in secularizing environments, and that both resurgence and secularization share root causes.