Pew Research finds that in some key ways Americans ages 18 to 29 are considerably less religious than older Americans and Fewer young adults belong to any particular faith than older people do today:
Indeed, Millennials are significantly more unaffiliated than Generation Xers were at a comparable point in their life cycle (20% in the late 1990s) and twice as unaffiliated as Baby Boomers were as young adults (13% in the late 1970s). Young adults also attend religious services less often than older Americans today. And compared with their elders today, fewer young people say that religion is very important in their lives.
Yet in other ways, Millennials remain fairly traditional in their religious beliefs and practices. Pew Research Center surveys show, for instance, that young adults’ beliefs about life after death and the existence of heaven, hell and miracles closely resemble the beliefs of older people today.
Though young adults pray less often than their elders do today, the number of young adults who say they pray every day rivals the portion of young people who said the same in prior decades. And though belief in God is lower among young adults than among older adults, Millennials say they believe in God with absolute certainty at rates similar to those seen among Gen Xers a decade ago. This suggests that some of the religious differences between younger and older Americans today are not entirely generational but result in part from people’s tendency to place greater emphasis on religion as they age.