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There is a Scripture (I can't remember where it is) that discusses so-called Christians who left the brethren, but they were never saved to begin with. I believe that you are one of those people. See, there's a difference between calling yourself a Christian and actually being one. If you are, in fact, saved, you will continue in the faith. You will not decide, "Oh, well. I'm bored with Christianity. I'm going to try Satanism for a while."
There are false Christians, and it sounds like you were one of them.