All religious minded people are devoted to their own religion. The Buddists are no exception and there is no question about raising suspicion about the sincerity of present day Buddists.
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yoga and meditation
it hasn't
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The current Buddhist leader is His Holiness the 14th Dalai Lama.
Within the Buddhist faith, the cycle of incarnation still continues today.
Bedford park London W4 - Buddhist monastery.
Euclid (of Alexandria).
Mexico is a roman catholic country and is very much devoted to the pope and virgin mary.
Antarctica is devoted to science.
There is no such thing as a most devoted religion. It is the people that believe in it that are devoted. Each would claim their own adherents were the most devoted.
Buddhism is a world wide religion. As a consequence it is practiced everywhere. Even cultures which profess other religions (American:Christianity) have incorporated Buddhist thought into their daily lives (belief in reincarnation, meditation, knowledge of the Dalai Lama, use of Buddhist quotations, use of Buddhist images, etc.)