Craig Blomberg over at the Denver Seminary web page has an interesting article at the link below on the one statistic churches never seem to track: how many die in their faith. If we believe in the old-fashioned doctrine of perseverance of the saints, we know that only those who carry on to the end truly prove their salvation to be genuine. So how many converts leave the faith before they die? Those who do prove their salvation was not real in the first place.
Denver Seminary Blog