Theism v/s Satanism (v/s Atheism v/s agnostics) ?

We learn progressively. If my parents had their way I would have heard of only theism. But I learned atheism, liked it and converted to it as a youngster. Then eventually I came to know of agnosticism and realized that this was more agreeable to what I believed in. I recently came to know of another theory, the theory of Satanism. This is enshrined in 'The Satan's Bible'. The name has a devilish tinge to it and that is what attracts the rebelious amongst us, my interest though was solely academic. Now Satanism is not the worship of devil as the word may sound like to most. It is basically the non existence of inhibitions, restrains that bind you. It talks to freeing the man enslaved by the various conditions of being good put on the behavior of people by the church (satanism for some reason chooses to take a stand mostly to the Christian church). Basically it is the recognition of everyone to seek his fulfillment and to enjoy everything he or she possibly can on this earth without being judged by some moral judge, that no man's salvation should be dependent on his self-denial. They do however respect the fact that such fulfillment should not harm anyone. To me this sounds fair enough. I didn't find the motivation to complete the book as it goes on a somewhat unintelligent attack on the church at times. Reviews though speak of the principals in depth and that made me realize that Satanism is a credible alternate to Theism. I do not think that Satanism is in any way opposed to Agnosticism or Atheism, in fact many Satanists might belong to one of these categories. Satanism didn't seem wrong in it's teaching but didn't really appeal to me either.
My basic point is everyone should be given a choice before being told to follow something or the other. The de-facto way of following your birth religion is not something which helps in the spiritual uplift of a soul !