I understanding where you are coming from. I teach 8th Catechism. I've had these kids for 3 years now. I make/encourage my kids to look stuff up themselves.
Things I know I've taught them repeatedly, the next time it comes up I get a vacant stare. I have drilled covenant into their little brains. I'm just not sure it took. Some Sundays, seem like a waste of oxygen for all they seem to get it. So, it's not like some of us aren't trying. And it worries me, alot.
Why not ditch the curriculum for a few days, and ask them what THEIR deepest questions are? Do they wonder about dating, sex, and relationships? ...terrorism and death?... their parents' divorce?... extistential questions re: worldview? Find whatever keeps them up worrying at night and show how Christ offers the only workable answers. Then you'll get some enthusiastic students.