They definitely don't worship Satan,but they sacrifice to him:if you look up 'kaparot' on youtube,you'll see Jews waving white chicken over their heads in order to tranfer their sins to these innocent animals.Now,apart that it is theologically ridiculous to believe in vicarious atonement(as also Christians do when they claim that Jesus bore all their sins),and an unheard of cruelty to animals,this obscene ritual derives from the Torah where Jews offer a scapegoat to Azazel on the Day of Atonement/Yom Kippur.Since Azazel was a bad desert demon and they sacrificed to him,it can almost certainly be said that they are NOT sacrficing white chicken today to God either.Just look at this vid for example http://www.youtube.com/watch?v=cXSE78KlB9o