Marianapolis was founded in 1926 by the Congregation of Marians of the Immaculate Conception and aims to educate high school students in the Catholic tradition of academic excellence, with a commitment to an active faith in God and a dedication to building character with content, compassion, and integrity. Students are exposed to Catholicism in a number of ways on campus including:
- Required First Friday Masses and holy days of obligation
- Optional Daily Mass
- Marian chaplain Rev. Timothy Roth M.I.C., who also serves as Theology Chair and lives in a monastery on the school’s campus
- Four Penance services throughout the year
- Confession, offered daily
- Evening Sunday Mass for boarding students
- Theology course offerings
- A Community Service Coordinator and Director of Campus Ministry, Michelle Murphy, who organizes multiple religious retreats as well as community service opportunities throughout the year.
- Knights Quest themes which encourage teachers to promote Catholic teachings
- Interact Club, which organizes outreach projects in the community
- Mission trips
- Disaster Relief Club, which brings awareness and support to areas hurt by natural disasters
- Attendance in the annual March for Life in Washington D.C.