Why does a baptized adult have to go through the Rite of Christian Initiation of Adults (RCIA)? Such a person may already know almost everything about the Catholic religion, its prayers, and the Ten Commandments.
Baptized adults preparing for reception into full communion with the Catholic Church need some instruction about its distinctive beliefs but also an experience of other adult Catholics praying, continuing to grow in their faith, and living out the corporal and spiritual works of mercy. Conversion involves the mind and the heart. Many parishes are forming RCIA groups this month.