<Tr> <Th> Religion </Th> <Th> Adherents </Th> <Th> Percentage </Th> </Tr> <Tr> <Td> Christianity </Td> <Td> 7009240000000000000 ♠ 2.4 billion </Td> <Td> 6999330000000000000 ♠ 33% </Td> </Tr> <Tr> <Td> Islam </Td> <Td> 7009180000000000000 ♠ 1.8 billion </Td> <Td> 6999241000000000000 ♠ 24.1% </Td> </Tr> <Tr> <Td> Secular / Nonreligious / Agnostic / Atheist </Td> <Td> 7009120000000000000 ♠ ≤ 1.2 billion </Td> <Td> 6999160000000000000 ♠ 16% </Td> </Tr>

Which of the following is the largest religion in the world based on number of adherents