Check out this interesting article from the Faith That Lasts Project by Barna Research Group:
Parents and leaders have long been concerned about the faith development of the generation born between 1984 and 2002—and for good reason. First, Barna research shows nearly six in ten (59%) of these young people who grow up in Christian churches end up walking away from either their faith or from the institutional church at some point in their first decade of adult life. Second, the unchurched segment among Millennials has increased in the last decade, from 44% to 52%, mirroring a larger cultural trend away from churchgoing among the nation’s population.
Third, when asked what has helped their faith grow, “church” does not make even the top 10 factors. Instead, the most common drivers of spiritual growth, as identified by Millennials themselves, are prayer, family and friends, the Bible, having children, and their relationship with Jesus.
Barna Research Group