They were inspirational literature compiled from oral history, inviting everyday people to share inspiring real life stories that they would compile and publish

They were inspirational literature compiled from oral history, inviting everyday people to share inspiring real life stories that they would compile and publish in themed collections. The market for inspirational literature includes many religious people in general, and they had no reason to exclude stories infused with religious or Christian content, but most of the many books were not Christian themed per se (although some explicitly were). That they admitted Christian stories at all, or sometimes used striaghtforward Christian references in some titles or prefaces was enough to make them unpalatable to some, of course.