Few realize how much Americans’ journey through their twenties has changed during the past half-century or understand how incorrect popular assumptions about young adults’ religious, spiritual, and secular lives are. Today’s twentysomethings have been labelled the “lost generation”—for their presumed inability to identify and lead fulfilling lives, “kidults”—for their alleged refusal to “grow up” and accept adult responsibilities, and the “least religious generation”—for their purported disinterest in religion and spirituality. These characterizations are not only unflattering, they are deeply flawed. The Twentysomething Soul tells an optimistic story about American twentysomethings. Drawing on hundreds of interviews and a survey of thousands across America, it introduces readers to the full spectrum of American young adults, many of whom live purposefully, responsibly, and reflectively. Some prioritize faith and spirituality. Others reject their childhood religion to explore alternatives and practice a personal spirituality. Still others sideline religion and spirituality until their lives get settled or reject organized religion completely. There is change occurring in the religious and spiritual lives of young adults, but little of it is among the 1 in 4 American twentysomethings who have consistently prioritized religious commitment during the past half-century. The change is rather among the now 3 in 10 young adults who, though intentionally unaffiliated with religion, affirm a variety of religious, spiritual, and secular beliefs. The Twentysomething Soul will change the way readers view contemporary young adults, giving an accurate—and refreshing—understanding of their religious, spiritual, and secular lives.