I think its important to understand that the devil is not a god. The reason Wiccans and others say that the devil is a Christian thing, is because it is. Literally before various translations of the bible the character of the devil bridging a number of stories with different characters did not exist. Lucifer’s falling is a mistranslation of some kings name, a guy who actually lost his throne. The serpent in the garden isn’t the Satan of Job. The Sons of god who came down from heaven and married human women aren’t Lucifer. The sons who laid with human women aren’t directly linked to Christ’s temptor. All of this is a construct and conflation. However, it is a powerful one. If you believe the things these (unwitting?) designers thought were evil are good and the things they thought were good were evil, then why not take up that figure? Whether you know academically its a construct or not. I think the crusades are evil not good. I think sex and masturbation for pleasure only is good not evil. So yeah the devil character(s) have a certain allure.