First, two apps (full disclosure, I cringe at sending you things that would increase kids’ screen time, but perhaps these are good uses of a screen?):
Bible for Kids app – for younger kids. Kids can navigate to different Bible stories, listen to the story, then complete a fun game or activity.
Kid’s Bible Experience (inside the YouVersion Bible App – enable the ‘Kids Bible Experience’ in settings) – daily vlog type devotional geared at pre-teens and younger teens. Includes some push toward self reflection and applying scripture to your own experience. I think you can set this up for daily notifications/reminders.