You can't ralize that the Satanist church has nothing spiritugal about it. They are hardcore atheists and they have humanist goals. Most atheists are humanists.

They don't have a 'bible' as you put it, and they are NOT a 'religious organisation. They were created as a joke - to mock Christians in their silly belief in Satan.

There are no such things as magic or divine purpose, and atheists are well aware of the mystery of life. We just don't pretend that there is a god to in order to answer them.