Social constructivism is primarily linked with Austrian-American sociologist Peter Berger and Austrian sociologist Thomas Luckmann, who together wrote the book The Social Construction of Reality (1966). This book brought Alfred Schütz's phenomenological approach closer to the English-speaking world. In their opinion, society is a dialectical phenomenon, because it is at the same time a product of human action, but it also affects it. The product of that dialectical relationship is the perception of the social environment as an external and independent reality that affects us. Berger calls this reality a "nomos." Religion envelops nomos with an aura of holiness, so nomos becomes a sacred cosmos.

References: 

Berger, Peter, and Thomas Luckmann. The Social Construction of Reality (1966).