First, you don't worship demons, you summon and command them with all of the disdain you can muster, and you give them no respect whatsoever. You have to learn how to make them grovel and whine. AANND, you have to cheat them at every turn because you already know that they're going to do the same thing to you. You also have to learn to be cheap - no soul-selling - they do what you want, not the other way around! You can't outsmart them, so you have to be sneakier than they are. A good text for this is the Popol Vuh!