Hinduism - the oldest religion still practised Islam - most practiced religion in the world Judaism - basis for Christianity Christianity - modified form of Judaism Buddhism - most practiced religion in Asia
The religion of Jainism is most practiced in various parts of the world that include USA, India, Canada, and Hong Kong among others. This is a religion that was founded in India and has a population of over 5 million.
Religion was practiced by the indigenous peoples of the Americas probably for tens of thousands of years. If the land bridge of the northwest really was the means of egress from Asia into the Americas, then religion was first practiced in what is now Canada and the northwest US.
The most practiced religion in the world is Christianity. There are about two billion practicing Christians. About half of these are Catholics, and the majority of other Christian faiths include Protestants and Anglicans.