In recent years, there has been a growing argument that the end product of secularization may not be a disappearance of all things religious, but rather a polarization between a larger secular group in society and smaller religiously fervent and active communities. Yet, there has been little empirical testing of this theory in contexts of advanced secularization. The aim of this paper is to fill this gap by studying individual belief and religiosity trends over the past four decades in Great Britain, searching specifically for evidence of the population splitting more and more between religious ‘nones’ removed from all forms of religion, and actively religious individuals characterized by strong beliefs and favourable to the public involvement of religion. Analysing descriptive statistics from the 1983–2012 BSAs as well as more detailed models from the 1991, 1998 and 2008 BSAs, we find growing differences in levels of beliefs and attitudes towards public religion between the increasing proportions of unaffiliated and, in recent years and among younger cohorts, more stable proportions of religiously committed individuals. The remaining religiously committed generally have stronger beliefs and more favourable views towards religious leaders influencing politics in 2008 compared with 1991, and the unaffiliated, less favourable views towards public religion.