I would ask him something along the lines of whether he thinks that convert baptisms in the USA have slowed, or been disappointing, and whether that is more a reflection of the church and its changing relationship with the public, or whether it is general reflection on American society and the growing irreligious of it.
Along the same lines I might ask what he feels the impact of the Godmakers et al. has been on church growth, esp. in the internet age.
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