To illustrate this better, I'll compare what a xian needs to do with what a Satanist needs to do.
Xianity is very simple: all you have to do is have faith, pray, go to church and you'll be "saved".
If a Satanist does just that it will be as if he does nothing and will receive no benefits. He will need to practice power meditation every day to empower his soul. This is the most important practice here, anything else is optional. In addition, Satanists usually open their astral senses after some time with practice and perseverance and communicate with the Gods astrally/telepathically, they don't just have "faith". Satanists also typically use magickal workings to improve their lives, fight back against their enemies or help their loved ones, if they need them.
Satanism has more to do with the occult/esoteric tradition than with mainstream religions and you need to learn a lot of things here to practice correctly. That's why being a Satanist is much more complex compared to xianity. I've had people ask me "all that stuff about runes, chakras, RTRs, auras, elements, sigils e.t.c. is too much for me, can't I just pray to Satan like I used to do in xianity?". My answer: "you can, just don't call yourself a Satanist if you do that".
Satanists actually discourage people from following Satanism as if it's just xianity with a different god.