This paper looks at the unprompted acceptance of T.G. Masaryk's religious-philosophical ideas by the founders of the Czechoslovak Church (CC) and their attempts to build a progressive national church in the spirit of Masaryk. A special section focuses on the CC's modified Christology, which allowed for the application of Masaryk's synergism to the CC's theology and spirituality. The conclusion explains the historical and political context in which the modern theology of the CC and its state-building, progressive orientation was gradually phased out by the church in the 1950s to be replaced once again by more conservative Christian teachings.