Right on tiger.
Now, the notion of dark service is not only christian. What is, is the notion that God cannot deal with imaginary 'rebels'.
The 'church of satan' actually divided into some 'temple of Set' which got rid of childish christian imagery. It is supposed to be a more intelligent approach, going into ancient dark gods. They have a site:
www.xeper.org
BTW this topic is, how the christian notion of satan really is perverted, not inheritated, from the original hebrew bible. There is such a concept in sinaitic Judaism but it is - no way - not a 'rebel' against God's will(just an idiot idea! If God is almighty, none can be 'rebel', maximum you can act as if, but it will stay in the plan, you will just end up hurting yourself.) The idea in Judaism, is of the angel of death, who is also in charge of testing humans with the goal of stimulating their moral growth. So the legions of the angel of death will cross human ways and act as if it were an enemy, but deep inside the intent is to induce progress through challenge.
Now if you are dumb enough to trust the 'rebel satan' lies, you really live in a world of desolation, paranoia and deserve pity, or the people that you may influence deserve pity...
The approach of the TOS ought to be some kind of a scientific one: awareness of some mix of forces in the universe, and choice of one 'side', although questionable, is more harmonic to the structure of the world, thus more legitimate, than plain cosmogonic lies that even a 3 year old kid shouldn't believe.