Na ja... I think a solid amount of the philosophy is sound (the 'humanist' angles), but at this point in life I don't really care to be boxed into anything anymore. Satanism was key for me in breaking free of the box that religion had built around my life, and back when I 'jumped ship' having another label to jump into was something I needed. (Also - Christian to Satanist? What a stark contrast!)
Right now I'm satisfied with being an atheist who doesn't require any other religious labels to be placed on him. Atheist is what I am, not something I have to adhere to. This allows me to make up my own mind, free from anything hanging over me.