Are there any other former top 5 QB's playing in church leagues?
Not church league, but JUCO...
2015
http://www.latimes.com/sports/usc/la-sp-usc-ricky-town-20170806-story.html
2016
https://www.cbssports.com/college-football/news/malik-henry-has-enrolled-at-a-new-school/