There is no saint named Zoraster in the Catholic Church.
If you are referring to Francis of Assisi, his followers are called Franciscan. If you refer to St. Francis Xavier, his followers are called Jesuits.
Zoraster
zoraster
Saint Bernards. (woof!)
Zoraster.
Saint Rani
Franciscans.
The followers of Hinduism are called Hindus
Followers of St. Dominic de Guzman were from the Order of Preachers, better known as the Dominicans.
Followers of god Shiva are called Shaivites.
Adam, the Old Testament patriarch, is not accorded the title of saint and was never canonized. The title of saint is usually reserved for followers of Christ - New Testament.
Mussolini's fascist followers were called "Blackshirts."