The “strict-church thesis” is a bit far-fetched and grossly over-generalized. It certainly doesn’t take into consideration the sociological shifts that evangelical churches are facing today. From Christianitytoday.com:

We evangelicals have long chalked up our success to this “strict-church thesis.” People are leaving liberal, mainline churches, we say, because liberals have compromised the gospel, and people are flocking to evangelical churches precisely because we have remained true and firm in the faith.

But a new book — Holy Mavericks: Evangelical Innovators and the Spiritual Marketplace, by Shayne Lee and Phillip Luke Sinitiere (NYU) — argues that the strict-church thesis does not hold water. The authors look at five mega-ministries in broader evangelicalism, movements led by Joel Osteen, T. D. Jakes, Brian McClaren, Paula White, and Rick Warren. They examine these ministries through a marketplace approach to American religion, which analyzes spiritual supply and demand, marketing techniques, religious needs, and so forth. […]

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