Is Satanism all about anti-Christian blasphemy? No. Rebellion against Christianity is
not the sole or main focus of most kinds of Satanism -- at least not for the majority of those Satanists who remain Satanists for more than a few years. For most longterm Satanists, the central aim is self-development of various kinds -- "to become as gods." For some theistic Satanists, the central point of Satanism is simply the veneration of Satan. For myself, theistic Satanis is about both the vereration of Satan and an encouragement of thinking for oneself.
At least some Satanists (I'm not sure how many) have never felt any need for rites of blasphemy at all. At the opposite extreme, some are
blasphemy fetishists.
In between these two extremes, there are many Satanists for whom blasphemy -- and not just anti-Christian blasphemy -- serves some worthwhile
short-term goals, primarily as part of self-initiation, or as an occasional catharsis. Likewise other kinds
of ritualized taboo-breaking.
There are also some theistic Satanists (a small minority, as far as I can tell) who practice rites of blasphemy regularly as part of a declaration of exclusive allegiance to Satan.
Some may ask: Why bother to blaspheme a "God" that you don't believe in? If you're an ex-Christian, the idea of deliberately blaspheming the Christian "God" may seem downright silly to you ... yet still, at the same time, vaguely scary somehow.
The point is to face those vague fears head-on.
By facing subconscious fears, you can overcome irrational inhibitions. Ritualized taboo-breaking can help you learn to think more independently -- on a deep level, not just an intellectual level. And it can open a gateway to your subconscious mind, thereby helping you to become more creative and perhaps even opening a door to psychic and spiritual development.
For these theistic Satanists, blasphemy against the Christian "God" may also be seen as serving other purposes in addition to the psychological ones I've mentioned, the exact purposes varying with the particular Satanist's theology. For example, it can be seen as a way of banishing the Christian "God's" influence from one's life. Or, for some, it can be seen as a way of drawing closer to Satan on the basis of "the enemy of my enemy is my friend." Still others believe that all gods, including Satan, are really just aspects of one God with many names, and that, by blaspheming Christian symbols, one is just blaspheming a harmful mythology or "idol," not really blaspheming God.
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What kinds of taboos should you break? Depends on your upbringing. If you were brought up Christian, then a rite of anti-Christian blasphemy is appropriate. If you were brought up, say, by Communists, then perhaps some ritualized politically incorrect talk might be better. If you were brought up by neo-Nazis, play some music by nonreligious ethnic Jews, and perhaps write and recite some poems in praise of some ethnically Jewish scientists, artists, etc. whom you personally admire. If you were brought up by vegetarians, treat yourself to a
filet mignon. (Eating meat is one of the "5 M's" of the Tantrik ritual.) Whatever you do, it should be something that you are comfortable with on an intellectual level, yet still find deeply frightening or otherwise disturbing on an emotional level.