If you study religion even a little you'll probably see something along the lines of a "big five" religions: Hinduism, Buddhism, Judaism, Christianity, and Islam. There's no doubt they are bonafide religions. But they aren't the only ones. There's Sikhism (founded in the 1400s), and Jainism (which I'm not sure how old it is). Then there are the "new" religions. Some are new takes on an old idea, like Mormonism or Jehovah's Witnesses. Some are not as directly related to older religions but are nonetheless widely accepted like Bahá'í Faith and others. Then there are the even newer and more controversial ones like Scientology, Falun Gong, and Wicca. And going even further you have people who say their religion is Kopimism.
The question, simply, is where the line gets drawn. Is there some quality that a religion should have in order to gain our respect? What separates a legitimate new religion from a cult, from a joke or an excuse/trick to behave in certain ways and get the protections of religion, from a social movement?
Please try to be respectful.