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The Order of the Walls (ウォール教 Wōrukyō?) is a religious organization that considers the Walls to be sacred, with a lot of religious and political power within them. Some of the church's members possess knowledge about the Walls that is hidden from the general public.
The church worships the Walls over everything else, believing them to be sacred and untouchable. They worship Wall Maria, Rose, and Sina, and think that it is their responsibility to protect the Walls from any "impurities", like humans, rails, or Wall-mounted artillery. They have been shown to be unknowingly loyal, to the point where they would sacrifice their own lives if it meant the protection of the church's secrets. In addition, they believe the Walls were a gift from God bestowed upon mankind in order to defend them from the Titans.
Among those in the Order of the Walls, there are a variety of different people from different places. There are also pastors who represent the Order of the Walls. An unknown number of pastors is involved in deep secrets regarding the Walls, which also includes information regarding the Wall Titans and possibly even the mystery of the Titans. The only named member of the church is Pastor Nick, although several unnamed Pastors and priests make notable appearances.