I don't so narrowly conceive participation in the Church. Furthermore, in my view, "the secular" is not the opposite of "the sacred," but only refers to realities that are not explicitly religious. Globally, Christianity is not in decline. In the West,  
any declines in institutional forms of Church participation have not been to an extent that warrants the Post-Christian lament of +Chaput, Rod Dreher and others. Many of the increases in the numbers of "nones" and "dones" are quite hygienic, religiously & spiritually, as neither you nor I would believe in the God, Whom they've rejected. Secularization in our increasingly pluralistic, multicultural, globalist world is a good thing, in my view, opening us to an age of authenticity. Authenticity in a sense with which both Taylor and Lonergan would resonate is a shared soteriological trajectory of all of our great traditions, realizable to varying degrees. The Continent suffered a militant secularism, which won't be the fate of the USA.