Originally reformation was very successful in the valley. In 1589 10 out of 13 churches were protestant ones. But counter-reformation hit hard, and violently. On 25th April 1623 20 protestants were murdered by catholics. Afterward protestant service was completely forbidden. Only a arbitral verdict of the of the canton's countil ("Drei Bünde") in 1642 resulted in an understanding between the two confessions.
Right that same year the protestants started building their own church. Very typical for a protestant church after Zwingli's and Calvin's rules it is a simple rectangular hall without a separate choir.