There is no "Buddhist language" so Buddhists speak the language of the country they live in.
I can speak for other religions but as for Buddhism a Monk a can leave at any time. Buddhism is about personnel growth and development. If a Monk or Nun feels that they have attained enough wisdom and want to leave they can.
There is no language of Buddhism. Individual Buddhists speak whatever language they and their countrymen speak. Many original Buddhist texts are written in Pali in the parallel way that many original Christian texts are in Hebrew, Aramaic or Greek and the vast body of Christians do not speak these languages
Sanskrit is primarily used in Hinduism and some of its branches, such as Buddhism and Jainism. It is also used in some traditional rituals and prayers in these religions. Additionally, Sanskrit is used in Sikhism for certain religious texts and hymns.
Buddhism is structured into several different schools of thought. For instance, there is Mahayana Buddhism, Theravada Buddhism, zen Buddhism, Nichiren Buddhism, and Pure land Buddhism.
I am assuming that what you are asking is how does Buddhism today compare to what the Buddha taught. Buddhism over the years has been enriched by each culture that has been exposed to; changing the nature of practice just slightly each time. So Chan Buddhism (China) is slightly different in practice then is Zen Buddhism (Japan, Korea). But the teachings have always remained the same. Now when I speak of practice, it is the methods used to teach the Dharma (the teachings). The biggest change in Buddhism since the Buddha is the development of Mahayana Buddhism. Mahayana Buddhism, to which is the tradition I practice, added teachings from later Buddhas and Bodhisattvas to The Buddha's original teachings in regards to living a compassionate life to help all other beings. So Buddhism adapts the methods but never the message or teachings.
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There are no rituals in Buddhism. Infact Buddhism is against rituals. Buddhism is nothing but morality.
pure-land buddhism zen buddhism buddhism ??
Buddhism is a religion/philosophy not a language. Although the original Buddhist texts were written in Pali, modern Buddhists speak local languages throughout the world. In the Christian Church Latin became a universal language of government and education due to the fact that a powerful government using Latin and which adopted Christianity controlled most of Europe. This did not have a parallel with Buddhism and Pali.
It is a sect of Chinese Buddhism, derived from the pure, Indian Buddhism.
Buddhism is a type of religon