Generations: The Real Differences Between Gen Z, Millennials, Gen X, Boomers, and Silents—and What They Mean for America's Future

by Jean M. Twenge

2020, nearly as many Millennials were religiously unaffiliated as were Christian (see Figure 5.43). That’s in contrast to Boomers, where nearly three times more were Christian than unaffiliated. That’s an enormous generational difference.