The thing about "Christian movies" or literature is that to make a real story, there just isn't enough hard detail in the Bible.
Now, take for example, the story of Ehud, in Judges. We know things like, Ehud was left-handed, King Eglon was obese, etc. But we don't know (based only on Bible verses) what they wore, what the king's chambers looked like, if Ehud was good looking, etc.
So, what are we supposed to do, if a movie was ever made about the Judges?
Put the actors, naked, in front of a blue screen as not to depict anything incorrectly?
Even then, with the actors, chances are, actors in the American culture do not indeed look like (skin color, facial features, build, etc) how Ehud and the Israelites of the time did.
So, what do you do?
If you're only basing a film or piece of literature on the specific Bible verses, and not in addition to good, solid, supporting evidence of other things, you won't get very far.
Same with songs.
(In direct comment to OP) Who knows if there was indeed a hill?
Who cares if there was indeed a hill?
The song, the Bible verse, etc. will not lose it's meaning or (in the case of the Bible verse) validity if there was or was not a hill.
Wow... A serious post by JesusWasn'tWhite. (Ok, so this line is semi-sarcastic, but all the stuff prior was serious)