Today, Buddhism is probably least evident in many of the Muslim nations. Countries like Saudi Arabia, outlaw any religion other than Islam.
Paraguay
It is a ghost town
Peru
K
No. The Ottomans adopted Islam and today some 99.5% of Turks are at least titularly Muslim.
Buddhism is least evident in the country of India.
Today, Buddhism is probably least evident in many of the Muslim nations. Countries like Saudi Arabia, outlaw any religion other than Islam.
Australia
Buddhism began in Asia, around 1500 BC. It started in India, then spread to China, then to Thailand. Thailand is currently the most Buddhist country in the world, at 95% Buddhist. Modern Nepal's major religion is also Buddhism.
Most Buddhists live in Asia, primarily in China, but are dispersed all over the world.The majority of where buddist live today is in Japan Most Buddhists live in the country of Thailand and Cambodia.
This is quite hard to answer without a definition of influential. Many Buddhists practise alone without any external signs of being a Buddhist. So for example if the President of a large country was a Buddhist would this make Buddhism influential even if he was the only Buddhist?
Today, Buddhism is found in Thailand, Sri Lanka, Myanmar, Cambodia, Laos, Japan, China, etc, and in some parts of India, Pakistan, Bangladesh and Nepal, also in the European countries and the USA. It is believed that the Buddhist population of the world is over 500 million.
Buddhism appealed to all social classes, but probably least to the Brahmins, the priestly caste.
While "officially" Buddhism may not be a leading religion in many western countries it is among the quickest growing. Buddhist thought permeates much of western society - children at schools often start the day with a period of "mindfulness" derived from Buddhist practice, people often speak of the karmic value of certain activities, Zen koans are often written out as inspirational plaques. Vegan, vegetarian and anti animal cruelty groups are common.
It is the modern branch which is the nearest to the original. Buddhism has at least two main branches, Theravada which started in 6th century BCE and Mahayana, 3rd century BCE.
There are at least three: Buddhism, Jainism, and Hinduism.
Those who believed in Sanatan Vedic philosophy were least affected by Buddhism since the Vedic philosophy preached of Life Optimism and Living Blissfully whereas Buddhism had a tone of Pessimistic thought of Miseries though both believed in Righteousness and Right Paths.