Are devil worshipers real?
Well sorta. There a few different types of “Satanists”. One is the Anton Szandor LaVey group. They do not worship Satan or even believe in the existence of any deity. Another is the “Church of Satan” which, again, is atheistic. This group is actually more of a political anti-theist group focused on enforcing the separation of Church and State. There are various occult practitioners who actually do believe in Satan although they give their conception in varying ways. In some Satan is identified with pre-Christian pagan Northern European fertility deities and in others, they accept an evil creature as defined in Christian literature.