This study presents the pivotal moments in the history of anti-ecclesiastical politics and architectural legislation. Definitive factors in church construction projects, the obtaining of planning permissions, fundraising processes, the identities of designers and the possibilities of designing, the size and quality of building materials have been uncovered through researching archival sources and church media records from that period. Regarding the tendencies of architectural morphology, it is safe to say that where financial conditions made it possible, commissioners insisted on traditional solutions. Highly qualified architects with international experience, Lajos Tarai, Antal Thomas, and Bertalan Árkay, however, identified with the modern ecclesiastical art evolving mainly in 1920s Germany. The detailed introduction of Bertalan Árkay’s work provides us with an opportunity to describe Hungarian architectural practice (designing every detail of the building including its interior and the reasons behind the repeated use of certain shapes in the building material), most of which can also be found in the international architecture of the period.