This article studies the recent shifts in the composition of the Brazilian religious landscape, focusing mainly on changes along two directions. The first corresponds to the widespread growth of evangelical denominations. The second refers to the continuous fragmentation and multiplication of the evangelical denominations from the first years of the 21st century. We use quantitative information from national demographic research conducted in recent decades and also specific data from the registry of churches and places of worship in the city of Rio de Janeiro between 2006 and 2016. The treatment and analysis of these data, underpinned by the bibliography related to religious detraditionalization and the process of secularization, allow for preliminary explanatory hypotheses for the referred phenomena.