Kurunir,

Here's a question for you: Have you read The Satanic Bible by Anton LaVey? The majority of your questions are answered in that book, some directly, and some indirectly. It may even be possible to find a copy in your native language, which I'm guessing isn't English.

Also, there are many excellent essays you should familiarize yourself with if you haven't already at The Church Of Satan website, specifically the Theory And Practice section.

Those two sources will give you a wealth of knowledge concerning Satanism.
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"Extraordinary claims require extraordinary evidence."
-Carl Sagan