When the movie came out, I know there was a big stink as to the church burning scene. Historians said that although Benastre Tarleton (Tavington in the movie) was a nasty soul, that there was no record of him ever locking people in a building and burning it down.
I don’t think any of these movies are meant to reflect specific historical accuracy. Whether the guy burned a church as a fact or not, it depicts the human toll in a very realistic way, I thought.