Niet-religieuze discoursen en de secularisatie van het seculiere: Een computationele studie van georganiseerde niet-religie in de Verenigde Staten en het Verenigd Koninkrijk (1881-2019)

Despite the growth of Non-Religion Studies in recent years, historical changes within secularity remain underexplored and there is a shortage of extensive longitudinal studies dealing with the phenomenon. This shortcoming arguably stems, on one side, from the lack of sufficient granularity in the commonly used longitudinal survey data and, on the other, from a chronic indifference of secularization theory toward the changes occurring within secularity itself. It was argued that secularization is a process of broader (non-)religious change, and that secularization theory can and should be extended to the analysis of non-religion. This thesis employs a series of computational methods, ranging from Topic Modeling to Sentiment Analysis and Dynamic Word Embedding, to explore a large collection of magazines published by two American and two British non-religious organizations between 1881 and 2019. The analysis reveals that the historical fluctuations in the relevance attributed to religion by militant non-religious organizations closely follows fluctuations in the public visibility of religion. Furthermore, in line with the theoretical expectations, the relevance of these topics is consistently higher among groups with a more radical orientation (i.e., among atheists rather than humanists) and in contexts characterized by a lower degree of secularization (i.e., in the US rather than the UK). On the contrary, the demand for positive non-religious identities remained prevalently stable over time showing signs of a descending trend only throughout the latest decades. Sentiment Analysis, in combination with linear regression, confirmed that the proportion of negative sentiment in religion-related topics is positively associated with the perceived relevance of religion. Finally, Dynamic Word Embedding revealed two prevalent shifts. On one side, the critique of religion progressively moved away from an ideological confrontation of religious others and towards a more moderate focus on pragmatic concerns. Second, the conceptualizations of atheism and humanism increasingly converged, emphasizing a positive non-religious identity, political activism, and the organizational aspects of the secular movement.