The most... what? As of 2014, the religion with most followers worldwide is Christianity.
The Catholic Religion is the most common religion in Peru.
The religion with the most flexible rules is the religion where the only question asked is "what is the religion with the most flexible rules?" and the questions "what religion is true?" or "what religion will grant salvation?" are ignored.
The most concentrated religion in the world is in England or the USA. The religion is Christianity.
Christianity is the most dominant religion.
The most common religion in Libya is Islam.
Hinduism is the most common religion in India
The most widely followed religion is Islam
what is the most common religion in new your
Most Estonians are not religious, however, the most popular religion in Estonia is Lutheranism.
Most Mayan art emphasized religion.
Roman Catholicism is the most common religion in Brazil.
There are defiantly is not any "most radical religion" in the world