Equal treatment as in being able to put up signs about your particular beliefs, whether you believe them or not, as the next guy. Should Scientologists be able to advertise?
Look up the history of Germany and the Scientologists; that is a whole kettle of fish to itself.
As for “equal treatment”, when it comes to trying to impose equal treatment of both good and evil, then that’s an impasse for society.
If said treatment is reserved for religious groups, then it’s not “equal treatment” to demand it for non-religious groups.
At least the Scientologists make a pretense to religion, thin as that pretense may be.