Everywhere you are and aren't, maybe.
Buddhism
Hinduism.
India
Christianity is mostly practiced in Europe
The most commonly practiced form of Buddhism is Mahayana Buddhism. The word Mahayana translates from the Sanskrit as "great raft". It is believed to be a vehicle that carries large numbers of people toward enlightenment.
south east asia
Commonly known in North America as tail gating the most common dangerous driving behaviour is following to close.
Agnosticism is a religious choice not really comprehended by most people religious people.
what is the first and largest category in the classifiction system most commonly used today?
It depends on what country you talk about. In the US for example all religions may be practiced as US accept immigration from almost all countries. In Indonesia, for example, Islam is the commonly practiced religion. In India, it is Hinduism, in China, it is Buddhism. In Vatican and most European countries, it is Christianity. and so on
Yes. It is the 3rd most practiced religion in the world.
'Chicago School of Business' seems to be the most widely accepted and practiced mgt. philosophy in use today.