The Seventh-day Adventist Church in the United States has been following a well-defined trajectory from sect toward denomination for the past century: it has reduced tensions with its surrounding environment by removing antagonisms between itself and the state and other religious organizations and as its members have become less peculiar in their lifestyles and beliefs and more integrated into society. However, over the past 30 years it has received an influx of immigrants from countries of the developing world who, generally, are more sectarian in their beliefs and behavior and more confrontative of other religious groups than is the typical American Adventist today. This process is especially advanced in some metropolitan areas such as New York, where Adventism has been transformed from a church of Caucasians and African Americans to a body where nine out of 10 members are now “new immigrants.” This paper poses the question of whether the influx of immigrants will reverse the trajectory of Adventism in North America, making it generally more sectarian.