Most adults in our Christian churches are not Christian in a biblical sense. A majority of the people who attend Christian churches are not Christian and have been attending the same church for nearly a decade.
I'd like to know more about this. We would say that none of 'em are Christian, of course, but that's obviously not what the author meant by that statement. What defines a "biblical" Christian in their eyes, and why are most adults not ones?
Depending on the answer, I might end up agreeing that half of Christadelphians are not "Christian in the biblical sense," which would be a powerful takeaway.