Buddhism. There are many different sects.
If you are referring to Sects, there are numerous sects in Buddhism. Probably the most famous are Mahayana, Theravada, and Zen.
Japan is home to several distinct Buddhist sects, the main ones being Tendai, Shingon, Pure Land (Jodo), Nichiren, and Zen. Each sect has its own beliefs, practices, and teachings, reflecting the diverse interpretations of Buddhism in the country. In total, there are approximately 13 major sects and numerous sub-sects, making Japanese Buddhism quite varied. The exact number can vary depending on how sects are classified and recognized.
Not all sects of Buddhism practice vegetarianism.
The are many schools of Buddhism and many sects in each school. many have monastic groups
Many Buddhists don't consider Buddhism to be a religion, but a philosophy. There are many different sects within Buddhism, like Mahayana or Zen, which use different techniques to understand the true nature of reality, and interpret the teachings given by the Buddha somewhat differently. Most of those sects believe that the other sects are all valid interpretations of Dharma, though there are some who think theirs is the only way.
Some of the SECTS of Buddhism are Theravada, Mahayana, Tibetan, and Zen Buddhism. Buddhism is a religion, and therefor it has no "religions".
sects are religious or political groups. Alida is a central figure in the "Pure Land" sects of Buddhism.
Buddhism has many sects and schools and so there is no single religious leader. Much as the pope may be regarded as a Christian leader, he is not the leader of all Christians.
Theravada,Mahayana, and Mantrayana
You can read about the different schools of Buddhism here: http://en.wikipedia.org/wiki/Schools_of_Buddhism
Yes, an accepted canon of sutras in Buddhism is the Mahayana sutra.