The Atlantic Monthly had a great definition of Buddhism The teaching founded by the Buddha is known, in English, as Buddhism. It may be asked, who is the Buddha? A Buddha is one who has attained Bodhi; and by Bodhi is meant wisdom, an ideal state of intellectual and ethical perfection that can be achieved by man through purely human means. The term Buddha literally means enlightened one, a knower. Buddhists believe that a Buddha is born in each aeon of time, and our Buddha—the sage Gotama who attained enlightenment under the bo tree at Buddh Gaya in India—was the seventh in the succession.
Buddhism is not a religion at all, in the sense in which the word is commonly understood. It is not a system of faith or worship. In Buddhism, there is no such thing as belief in a body of dogma which must be taken on faith, such as belief in a Supreme Being, a creator of the universe, the reality of an immortal soul, a personal savior, or archangels who are supposed to carry out the will of the Supreme Deity. Buddhism begins as a search for truth.
https://www.theatlantic.com/magazine/archive/1958/02/the-meaning-of-buddhism/306832/