The next market to succumb to the adult coloring book craze is religion and spirituality, with a slew of new titles lining up on the runway. For one title in particular, you’ll need blood-red crayons.

Alison Gary used to go to church on Sunday mornings, but lately she's embraced a different ritual: staying home and coloring with her 6-year-old daughter, Emerson. These days "I'm more into having ...