For most of American history, the congregation was the primary infrastructure through which adults formed and maintained friendships outside the family. Not because religious belief produced closeness — it sometimes did, sometimes did not — but because the congregation delivered the structural prerequisites: repeated contact on a fixed schedule, a shared identity around which association could organize, intergenerational mixing that crossed age barriers otherwise nearly impossible to breach, and a set of obligations (service, committee work, mutual aid) that generated functional cooperation, which is one of the most reliable friendship-formation mechanisms known. The congregation was an involuntary social machine — you showed up, and contact happened. For large portions of the adult population, especially parents with young children and older adults living outside workforce settings, it was the only such machine operating in their lives.
The secularization of American society has been uneven and contested, but the demographic shift is real: the proportion of Americans who report no religious affiliation has risen from around 5 percent in the early 1970s to above 26 percent in the early 2020s, with rates significantly higher among younger adults. The question this raises is not primarily theological. It is infrastructural: what replaces the friendship-formation and social-support functions that the congregation provided?
The honest answer is that nothing has replaced them systematically. The secular alternatives that exist — the running club, the yoga studio, the hiking group, the civic association, the political organization, the book club, the Meetup-organized gathering — each capture some features of congregational social infrastructure but fail to reproduce the combination of weekly rhythm, geographic anchoring, intergenerational span, life-event support (funerals, illness, new children), and low exit cost that made the congregation so effective as a friendship machine. These secular alternatives also tend to be self-selected by interest, age, class, and fitness level in ways that limit the social diversity and the duration that congregations provided.
The loss is compounded by the fact that secular alternatives require active curation where congregational membership was passive. You show up to a church and the social infrastructure runs around you. You show up to a Meetup group and you must actively manage your social participation in a context where no one is obligated to know you next week or care whether you return. The transaction cost of friendship formation in secular contexts is higher at every margin, and the absence of shared obligation means that the friendship infrastructure must be rebuilt from scratch by each individual rather than inherited from a pre-existing institution.
This is not an argument for religious belief or congregational membership as such. It is a structural observation: the friendship poverty of the contemporary secular adult is partly a consequence of having lost an institution without having built an equivalent, and no current secular alternative has demonstrated the capacity to serve the full range of social functions that the congregation historically provided.