You could send everyone out with an envelope and have them collect different colors God put in nature. Have them find a rock to sit on and be still for a half hour. Have them find something in nature that represents who they are, or what they think about God. When kids actually experience God, instead of just hearing stories about him, it catapults their faith to a new level and increases their desire to find God in Scripture. Again, it's that fellow-traveler idea.
Parents think they have to have an answer to every spiritual question their kids ask.
If you don't know the answer, find it together. Other than the Holy Spirit, nothing will solidify your young teenager's confidence in her faith better than searching for answers with you. At the same time, don't be afraid to leave some things unanswered. Part of knowing God is knowing that his ways are often beyond our understanding. Experience is key.