“Plan 9” is rather predictable: mostly valued low, but some find it interesting because of that badness.

https://www.imdb.com/title/tt0052077/ratings/

A good Christian-themed movie will be much more polarizing and for real. For example “Old-Fashioned” (2014):

https://www.imdb.com/title/tt2048824/ratings/

(Found it by specifically searching Rotten Tomatoes for movies rated lowly by critics and highly by the audience. For “Old-Fashioned” the ratio is 17/83. For “Plan 9” the ratio is 66/45, nothing spectacular.)