In America, church has always been a free market commodity primarily oriented toward the middle class. In class conflicts, the church has generally sided with management. Church congregants have not been working poor, but rather business owners and managers. Even the noble response of the initial social justice movement of a century ago was bourgeois. Its purpose was not to find solidarity with the poor, but to lend a hand to the poor to hoist them into the middle class
....the long decay of the church over the past generation coincides perfectly with the long decay of the middle class.
Even more haunting is Charles Murray’s Coming Apart. Murray explains that for the past several decades, church participation within the middle class has hardly changed, but it has disappeared almost entirely within the working class. His observation is easily confirmed by attending worship services. The working class is poorly represented in our congregations; people in lower classes have little means to support a congregation with time, talent, or treasure, and they perceive little value in the institution.
Christians around the country are wondering why churches are in decline. The reason is not Darwin or Marx, science or atheism, culture wars, or competition. It’s economics. As goes the middle class, so goes the church.