Satanists.
The followers of Hinduism are called Hindus
Followers of god Shiva are called Shaivites.
Mussolini's fascist followers were called "Blackshirts."
The followers of John Calvin were actually called Puritans.
Hazrat Isa AS is called Jesus Christ. His followers are called the Christians.
John Calvin's followers were called Huguenots in France.
They are called "Satanist" If they are followers of Satan, then they are generally called Satan or devil worshipers. If they are followers of satanism which is different then they are refered to as a satanist.
the deceiver
no one
Iblis
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.
Followers of Hinduisms are called Hindus.