Personally I'd go for Protestant scripture but I'm a Christian. Generally people in your situation would go for Protestant scripture. Usually only Catholics go to Catholic. BTW Charlotte AOG would be considered Protestant.

I used to teach Scripture and I assure you I wasn't there to brainwash the kids. I just taught them Bible stories in a fun way, we did some songs, played games and had a great time. It's about giving them the chance to see that the church isn't scary or irrelevant, and providing positive role models in addition to the other adults in their lives ( I'm not saying that only Christians can be positive role models). Unless there are ethics classes or teachers of other religions, non-scripture usually means sit in the library and read a book.

Why not go for Protestant classes, then if you have concerns you can always remove your child.