This chapter studies religious involvement, which mainly means attendance at weekend worship services. The strong connection between religious involvement and family life in the United States points to a larger conclusion. Religious involvement trends are not fundamentally altered by specific events such as terrorist attacks or natural disasters or financial crises. Such events may cause some changes in religious involvement, but those changes are usually short-lived. More fundamental and lasting change in American religious involvement is produced by demographic changes, especially changes in family and household patterns. As such, religious involvement is softening because one of the most religiously involved demographic groups—married couples with children—is shrinking as a proportion of American society.