Wikipedia calls it "a rare example of expressionist church architecture," and, well, I guess it must be rare, since I can't remember ever having heard of expressionist architecture.
The term "Expressionist architecture" initially described the activity of the German, Dutch, Austrian, Czech and Danish avant garde from 1910 until 1930. . . . The style was characterised by an early-modernist adoption of novel materials, formal innovation, and very unusual massing, sometimes inspired by natural biomorphic forms, sometimes by the new technical possibilities offered by the mass production of brick, steel and especially glass.Among the works said to be in this style are the Sydney Opera House and Le Corbusier's chapel at Notre-Dame-du-Haut. I know both of these well and admire them, but can't remember ever hearing them described as "expressionist."