Abstract
In this chapter, I deal with some of the reasons why the United States should not institute any implicit or explicit religion-based tests as grounds for immigration. I argue it is extremely impractical to formulate and execute a test that would be effective in rooting out extremists. However, even if such a test could be devised, immigration requirements that link religion to belonging inevitably foster an irrational fear of an entire group of people as perpetual outsiders. Furthermore, religion-based immigration tests set up a state apparatus where the government surveils its residents for their thoughts and beliefs.