While I think much (if not all?) of the audience were believers to some extent or another, the Gospel was preached.
A friend who, over the last 18 months, has gone through a few trials, joined us. I saw what was talked about speak directly to her.
At one point, Rob asked those who had been touched directly (themselves or a family member) by cancer to stand. This brought what seemed to be over half the auditorium to its feet. The point behind this is that the suffering eliminates the extra, leaving those affected looking at what is important. He suggested that someone given 6 months to live doesn't usually go "I guess I better go trim the hedges". Rather, they repair relationships and live life as fully as they can.
This will be an interesting book to read.