Here is Dietrich Bonhoeffer, in the mid 1930s, on talking to people in the parish who are not that interested:
There are three different modes of indecision which we should not confuse with one another:
First mode: there are people who receive such fulfillment through vocation and family that they lack nothing. They are satisfied, content, and fortunate. They attend church sporadically when it suits them or they feel the need for some celebration. They live alongside the church.
Second mode: these are the educated and cultured folk who are above ecclesiastical things. As one is above school and teacher, so is one above church and pastor. They are angry with the narrow-mindedness of the church and the partial education of the pastor. They deem some bits of knowledge from the philosophy of religion worthwhile. The educated stand, on the one hand, next to the church, and on the other, over the church. Perhaps today they feel that they will never again find their way into a real church.
Third mode: these are the callous, the discontented, the disappointed, who miss no opportunity for anger against church and pastor. They stand against the church. (Spiritual Care, Fortress, 1985)
Of course, everything is different these days:)