Principles of Budhism
The Buddhists did not believe in a God or a Creator on whom the destiny of man depends. In this respect and in so many others, Buddhism was original and unorthodox in its teachings, and it differed from other Indian religions like Hinduism that was Brahmanism.
But Buddhism accommodated traditional Indian divinities. It also did not want its followers to reject the old customs and traditions. This approach helped it to become popular and it spread very fast far and wide.
As the noted writer Borges observes, a good Buddhist can be a Lutheran, a Methodist, a Presbyterian or a Calvinist or a Shintoist or a Taoist or A catholic. He may of Islam or of the Jewish religion, all with complete freedom. In contrast it is not permissible for a Christian or a Muslim or a Jew to be a Buddhist.
Those who did not like Brahmanism for its caste-ridden rotten practices found the principles or philosophy new religion attractive and its interpretation of life and its insistence on a moral code of conduct made it a serious alternative of a religion.