Gah. Suffering and bliss are relative terms defined in relation to your beliefs, as James Hetfield wrote so eloquently, "One man's fun is another's hell." Besides, don't you think that Satan might want to take care of his own?
Satanism often praises strength of the individual and free-will above any God. The only person to worship is one's self. If you are not strong enough to stand on your own, you would likely not be considered worthy by Satan in many belief systems anyways. He certainly would not take care of you.
Anyways, I'm in complete agreement with einride on this. Christian Satanism is as ridiculous as Christianity itself. Other then some misguided attempt at rebellion (which is essentially: do the opposite of what is "good"), what purpose does it truely serve? You may consider yourself as living on the opposite side of their spectrum in terms of your values and beliefs, but you are still bound by the chains and close-minded thinking that is Christianity. You acknowledge it as your opposition. You live in their world. Their rules.
True freedom comes from relieving yourself of the shackles that is belief.. religion.
Although I obviously reject religion vehemently (not necessarily spirituality, as I seperate the two), I do find things such as Luciferianism or Chaos-Gnosticism pretty interesting to read about.
In terms of metal, I don't think there are any bands that really approach the subject in an intelligent or meaningful way. DsO comes close, but comes off as pretentious rather than genuine. Generally, bands that take a more Nihilistic or Spiritual approach are usually more intriguing and interesting. The denial of God without blatantly bashing or insulting him lends a much more subtle and powerful form of expression. It is also ironic (and humorous), that Christianity itself can be affixed as a Nihilistic belief. It really is quite interesting how nihilism permeates all aspects of life, not simply religion. It is both rational and irrational.
Anything from Agalloch, to Bilskirnir, to Rapture, can present an intereting (and different) ways to opposite Christianity without being blatant. The mocking nature of Kneel to the Cross by Sol Invictus is also pretty good, though it is not metal of course.
Bilskirnir, being one of my more recent listens, had one song specifically stick with me, likely because the lyrics were in english:
"To reach for the ancient land in the ultimate of north
Where pride and purity led to nobility
Idealism as the highest order
In accordance to natures eternal law of life
All falsehood unable to conquer our minds
Omnipresent was the god within ourselves
Suddenly... materialism became part of our lives
So the unity was disbanded
Soon we forgot about our inner voice
Man's instinct overcome by superiosity
Violation of the immortal soul
By deafening the voice of blood
Mental enslavement of the mind
So the highest principles faded into unconsciousness
What once was pure and noble turned into mediocrity
From the pillars of civilization to spiritual decay
No blazing shine left in the eyes
Seemingly awake, yet already asleep
Will that slumber lead to everlasting death
or is fate going to be changed before?
If the divine spark in our soul
Is to become a rising flame once again
A new aristocracy, not of gold
But of spirit will rise again!
From the ashes of decay
A new union will evolve
The highest principle back in full-force
And idealism will lead us again to nobility..."
Obviously this deals with more than simply Christianity as it is referring to society and it's decay, but it is still relevant to the discussion at hand.