A limited palette of materials - light-colored glass, wood, light-colored concrete brick, stained glass - gives a certain timeless abstraction to the volumetric composition and reinforces the symbolism of the building. Inside the church, the light is modulated to accompany the hierarchy of spaces. Through architectural devices, the sections of "matter" seem to detach themselves from each other to let the light in, always transformed. The ceiling does not touch the walls for the light must pass through, the choir wall stops because the light is there.

The ceiling is pierced by skylights, the one of the altar lights, the one of the baptistery lights, and the walls are lined with 14 openings, a Way of the Cross of light. This light is there to pass through us, to warm us. The stained-glass window expresses the "Space of Glory" which extends the mystical and gathering space; it transforms and converts light into the expression of the spiritual atmosphere. The space articulates a contradiction: the church is a public space and a mystical space. The space of the congregation is covered with wood to welcome the community of Montigny in its diversity.

The back of the nave opens onto the garden to extend the space.