I want to actually take the bible stories themselves, and portray them EXACTLY the way they are written, not either ignoring them or "Disneyfying" them to make them more palatable.
For instance, the story of Jephthah, who made a foolish oath to God so that he could slaughter Ammonite women and children (shown in graphic detail in a battle scene) promised he would make a burnt offering of the first living thing he encountered when he returned home. Well, as luck would have it, the first thing he encountered was his virgin daughter. Welp, and Oath is an Oath, so his daughter got 30 days to bewail her virginity, before she was sacrificed and burned to please Yahweh... (Judges 11)
Or the story of Elisha and the Bears (2 Kings 2). Some children make fun of the Bald Prophet Elijah, and he cursed them, when two bears emerge from the woods and start killing them. Now, this would be a tough one, do you get a real bear, or do you do a CGI Bear? Probably for safety reasons, you'd have to go with a CGI Bear, but you don't want to make it look too fake.