There was a blossoming of Modernist church architecture in St. Louis after World War II, particularly in the Roman Catholic Archdiocese. As hundreds of thousands of people moved to the suburbs, some pre-existing parishes saw new churches built, while brand new parishes sprang up, as well.
In the case of North American Martyrs, it was the latter. It’s the darnedest building to photograph, but it also has some interesting surprises such as the minimalist belfry below, and what looks to be some nice stained glass windows.
The interior was sparse, as were most Modernist churches at the time. I do not know how much of the original furnishings survive.
Founded in 1955, it lasted exactly fifty years, closing in 2005 during the penultimate round of parish closures. It was subsumed by Sacred Heart in downtown Florissant.
