Satan is father of lies.
If you say you're worshipping Satan, you're not lying, which is blasphemy. You're profaning Satan, not worshipping him.
To worship Satan correctly, conceal this fact from everyone, perhaps especially yourself.
The Church of Satan &c are punished by Satan for taking His name in vain. And boy does he take it seriously - look at those Palpatine faces. It's a very efficient way of destroying yourself.