'Religion geography' is the study of the distribution of
religions and how they got where they are, how they were created, and so on.
There are two types of religions in religion geography, a 'universalizing religion', and an 'ethnic religion'. A universalizing religion is a religion trying to appeal to the entire world, appeal to all types of people. The three main universalizing religions are Christianity, Islam, and Buddhism. An ethnic religion is a religion appealing to one group of people, one state, one culture.
References
★ An introduction to Human Geography The cultural landscape