it's different beliefs and religion
Theravada, Mahayana, and Tibetan.
There are 3 main Buddhist denominations: Mahayana, Theravada, & Vajrayana.
Mahayana is longer and easier path towards enlightenment and Vajrayana is quicker and more harsh and hardworking path towards the achievement of enlightenment.
Sexuality beliefs as well as the belief of what Guatama actually said. Similar to how the Catholics, and Christians diffused.
mahayana is one of two major Buddhism exiting mahayana is one of two major Buddhism exiting
Theravada, Mahayana, & Vajyana. The 2 most well known Buddhist sects are Zen & Tibetan. Zen falls under the Mahayana denomination, & Tibetan falls under the Vajyana denomination.
Around 185 Million people are Mahayana Buddhists. Source: http://en.wikipedia.org/wiki/Buddhism#Mahayana
the main beliefs of KKK are if it ain't white it ain't right
Mahayana scriptures are known as Sutras.
The main religious beliefs in the US is: Christ was born on December 25th.
If I understand your question correctly, Zen developed out of the Mahayana tradition. Tibetan tradition is different from both Mahayana and Zen.