Background The thesis of religious decline, central to secularization theory, has become massively contested among social-scientific students of religion. Its critics observe not so much decline, but rather change in the religious landscape of Western Europe, in effect pointing out that the decline of Christianity's traditional institutional, doctrinal and ritual dimensions should not be mistaken for a decline of religion tout court. Purpose In this research note, we address this ongoing debate among sociologists of religion by studying whether traditional Christian religiosity has declined in Western Europe over the past four decades, and whether the same applies to religiosity more broadly conceived. Methods To examine these trends over time, we analyze data from the European Values Study (1981–2017) for nineteen Western-European countries. More specifically, we carry out multi-level linear- and multi-level logistic regression analyses. Results We demonstrate that both traditional Christian religiosity and religiosity more broadly conceived have declined, with the former declining at a much higher pace than the latter. We also find that those who continue to be religious and/or spiritual deviate increasingly from the traditional Christian model. Thus, when one does encounter religiosity, it is much more likely to be non-traditional religiosity than was true in the past. Conclusions and Implications We conclude that religion has declined, whether one understands it narrowly as traditional Christian religiosity, or more broadly. Even though new forms of religiosity and spirituality cannot compensate for the loss in traditional Christian religiosity, they do make up an increasing portion of the overall declining religious pie. Finally, we reflect on the limitations of the data from the European Values Study (1981–2017) and make an urgent call for better survey data, especially by including more suitable questions with which to measure types of religiosity and/or spirituality that deviate from the traditional Christian model.