It can't be salvaged in print somehow?
Or just made use of?
When you consider that the majority of its members are just lay people practicing their faith in conjunction with living an ordinary life, there really isn't much that you can do with them to make it interesting. At least, not if you want to be
honest about them.
Look at their Wikipedia entry. The word "alleged" crops up nearly a dozen times. Most of the things they're accused of came from non-Catholics and aren't true. Except for the conspiracy theories that have cropped up about them, they're actually a fairly boring group. The only thing I can think of that might be a little iffy is a practice called "mortification of the flesh", which could be something as drastic as self-flagellation... but might simply be fasting.
In the Sixth World, this group might morph into a magical group, maybe. That would be about the only thing I could see as feasible.
I could see a runner or NPC being a member, maybe, for some additional color.