Religion, health and well-being are linked by religiosity. Religiosity or spirituality as preferentially used in the Anglosaxon context denote the human capability and willingness to believe in transcendent forces. In this presentation I will show that believing is a central brain function that underpins the formation of beliefs and faith. Specifically, the processes of believing integrate multimodal sensory information with a subject's emotional state. As the processes of believing evolve fast and outside a subject's conscious awareness they afford intuitive actions by predictive coding. In contrast, that what people believe may be articulated as beliefs and, thus, can become object of reflective appraisal. Notably, the recently coined term credition encompasses a neuroscience model of belief formation and updating as well as the cognitive psychology of beliefs and believing. In conclusion, cognitive neuroscience of believing opens a new avenue for the understanding of how humans approach (any) religion when developing their individual religiosity.