NEPAL is the only official HINDU State In the World due to this, the majority of the population in Nepal practice the Hindu religion (86% of the population), whilst the remaining religions are represented by Buddhists (8%), Muslims (4%) and ‘other’ (2%).
Large tribes and communities of indigenous origins, are also closely linked to the earliest synthesis and formation of Hindu civilization. Peoples of East Asian roots living in the states of north eastern India and NEPAL were also a part of the earliest Hindu civilization. The Hindu new year is also celebrated in Nepal in the month of April, usually falling on the 14th of the month. Nepal is the only Hindu country where the Hindu calendar, known as Bikrama Sambat, is the official calendar.
Since the roots of Hinduism was spread in Nepal for many centruries still Hindust are at a higher level here. Very old temples like PASUPATHINATH etc., shows the prevance of Hindust here for ages.
Buddism was originated from India only and later spread to Nepal and other countries, but in Nepal it is not very much. There are the reasons for Nepal having high percentage of Hindus-