I agree with Bishop Barron's article. I was shocked once when I asked my RCIA class what they wanted to learn. The first subject was Jesus. I had always assumed that everyone was Christian and was in my class to become Catholic. WRONG! I had Muslims, Buddhists, Wiccan, and once a Satanist, but most were basically nothing. They were taking RCIA to learn what Christianity is all about.
All catechists have to assume that their students know nothing. Start with Jesus.