In its simplest form you become a Buddhist when you choose to be a Buddhist. However, in a more formal sense many sects have ceremonies where you 'take refuge' in the three jewels the Buddha, the sangha (community) and the dharma (teaching).
Answer ON BECOMING A BUDDHIST. His Holiness, the XIV Dalai Lama, has stated many times that it may be best for Westerners to remain with their current religious attachment and not enter into the official posture of becoming a Buddhist. The perspective is that conversion is not part of Buddhism and so, one would not convert or encourage others to convert. One realizes Buddhism, usually after contemplation and study of Buddhism dharma. However, should one wish to begin practicing Buddhism, there are many great Buddhist websites, and www.dalailama.org is perhaps the best starting point. Because the Dalai Lama is aware of ALL types of Buddhism, his site offers enough information for someone to begin the practice, study and steps toward Buddhism. Since Buddhist teachings outline the impermance of all things, striving to be a Buddhist is actually in contradiction to being a Buddhist. First and foremost, one wants to be born Buddhist in the next incarnation. In the meantime, do no harm to others or yourself.
Yes, anyone can become a Budhist. However there are degrees of commitment. Many religions require an all or nothing approach to memebership. Buddhism is somewhat different.
All of these could be considered converting - some are overt, some are "closet Buddhist" approaches. All can be satisfying.
Buddhism
Ajatashatru
Yes.
Because Buddhism rejected the caste system.
There is no holy person or deity in Buddhism
Hinduism and Buddhism agree that a person life on earth is
A Lama is a designation in Tibetan Buddhism for a person who has been allowed to be a teacher of Buddhism.
Buddhist.
Yes, in some areas by some Buddhists
You call someone who practices buddhism a buddhist ur very welcome :)
Buddhists do not worship any person or deity, including The Buddha. Therefore the concept of a Savior that needs to be an intermediary between a person and god in order to purify or redeem that person is not a concept present in Buddhism. Therefore there is no Savior and none is needed for Buddhism.
He did not. We know that he helped the Buddhism to expand, by building temples and promoting the freedom of religion. But he was more on the philosophical side of Buddhism as a Greek, see the questions of King Milinda. Still because of him and earlier King Asoka, Buddhism became a religion from a philosophical movement.