[Alan] Wolfe, an unbeliever, told me he finds the kind of "stuff" he sees at venues such as the International Christian Retail show to be indicative of an anemic American evangelical subculture.
Wolfe said in no certain terms that he does not want Christians to "witness" to him about the gospel, but, nonetheless, he sees in Christian T-shirts, breath-mints, and boy bands the reality that Christians don't want to witness to him anyway. Wolfe said that he cannot imagine an unbeliever coming to faith through, say, a Christian bumper-sticker on the car in front of him. Buying the stuff gives Christians an easy conscience that they are carrying the Great Commission without ever having to verbally and relationally engage their unbelieving neighbors.
Whatever the "evangelistic" selling point of these products, I think the real reason they make money is an American Christianity seeking to form a common community, a common culture. Unfortunately, instead of finding this in churches, with one Lord, one faith, one baptism, we find it the same way the culture around us does: by buying stuff with the same logos. (Russell D. Moore, Mere Comments)
Another indication, to me, that most Christians today are no different than the culture around them. They just (sometimes) choose different brands.