If you really want to understand it, you're going to have to look at it from a completely different perspective. You can't understand Satanism in the context of Christianity.
Most Satanists don't actually believe in Satan. For them it is an idea...a representation of a lifestyle, etc. Even Satanists who do believe Satan is real don't generally worship him. Worship is seen as submission and Satanists do not submit to Satan. Satanists would not submit to any deity. Naturally, theistic Satanists do deal with Satan in their spiritual and magickal pursuits, but it is done on even ground.
Personally, I'm a theistic Luciferian and I do deal with Lucifer on a regular basis, but I'm not one of his "subjects." We don't believe in that. My workings deal with Lucifer as a friend, comrade, sibling, etc. There is no soul-selling, begging, sacrificing or anything like that. It's simply prayer and meditation.
What puzzles me most about your question though is your references to Jesus. Quite frankly, why would a Satanist care what Christ's opinion is? Why would a Satanist care about what Christ says and does? Why would a Satanist put any value in that? I know Christians don't care about Satan's opinion. Why then should Satanists believe what Christ says?