I am also an atheist, of a Christian family, who put me in a Christian school, I had the right to all the Christian baptisms, I hit the Christian doctrines, which for you confess one of the reasons which my a rotten life. But that's what prevents me from having respect for religions.
There is a difference between Satanic Theists and Satanic Atheists.
Satanic atheists are the likes of The church of Satan. Theistic Satanists are the likes of the Church of Azazel. The two are not the same.
The church of Satan considers religion a deception, and uses Satan in it's original Hebrew meaning as 'the opposer', they literally want to oppose organised religion.
The folks of for example the Church of Azazel do believe in the Devil and do indeed worship him.
I see so much confusion about this on these boards that I just had to clarify.