I was just wondering whether or not people openly announce that they are a satanist? I only ask this as equality is part of the law now and every workplace has to follow the quality act of not judging someone based on their beliefs.
Technically, yes -- employers are required to practice indifference regarding an individual's religious inclinations.
However just because that's the way the world SHOULD be, doesn't mean that's the way it IS.
Sure, announcing your religious stance at work isn't enough to get you in trouble.
However, as Mannyowar touched on, you might be "overlooked" for a promotion.
You might be written up for being two minutes late for your shift, when previously your boss may have let it pass.
You might start noticing that you're being written up more often for performance issues and eventually fired.
None of these have to do with your religion if a court looks at the evidence, however.
Catch my drift?
Additionally, look at the whole picture. Announcing affiliation with the CoS can impact more than your career.
For example, a friend of mine was attending a karate dojo some time ago. When the owner of the dojo found out about my friend's CoS affiliation, the owner kicked my friend out of the dojo.
That decision WAS based on religion. But, businesses reserve the right to refuse service to anyone, for any reason, including religion.
Is that the way it SHOULD be? No. Is that the way it IS? Yes.
Announcing your affiliation boils down to YOU. For some, going public helps them. For others, their strength is in secrecy.
If you think going public will benefit you, by all means go for it.
If you think secrecy is the way to go, keep it a secret.
Personally, I agree with Nemo -- if you have to ask, then you're probably better off keeping it a secret, at least for the time being.