St. Mary's Sunday School was first organized in 1999 with initially two teachers. Although it was small, the two teachers worked hard to establish a framework for the future of the Sunday School. Due to the growth in the number of families, St. Mary's Church felt that it was necessary to increase the number of classes, which required more teachers and a headmaster. The children meet every Sunday morning from 9:30 AM-10:10 AM. A general session is conducted from 9:30 AM – 9:40 AM with one student selected each week to teach the group a lesson and concludes with prayer. Currently the Sunday School uses the National text books and curriculum.

The program was established to instill in the children morals and values to carry with them. The Sunday School's goals are to build a strong and lasting foundation for the children emotionally, spiritually, and physically, and to provide a supportive, enthusiastic, and encouraging atmosphere. The Sunday School promotes teaching valuable lessons that children can utilize, and it slowly prepares them for obstacles and experiences they will encounter in the real world. The church strongly believes that the continuous support by the parents, dedication by the teachers, and the interest communicated by the children will allow the program to be a success and to grow towards excellence.