The devil is totally evil and you should hate him! Actual religious beliefs affect how religion is portrayed in pop culture, and of course affects how religious figures are portrayed. Now, Satan may not be Jesus. He’s not a paragon of virtue that is upheld by believers (unless they are Satanists, but we aren’t talking about them), but nevertheless he is an extremely important character in Judeo-Christianity.
Because Satan is an evil character, pop culture often pits him against the noble and righteous characters. When we talk about the devil in pop culture, we are often talking about the typical villain archetype. He is evil without reason or remorse. He does everything he can to destroy our virtuous heroes. Not only does he attempt to destroy them in the typical “I’m going to kill you” way, he also attempts to destroy our heroes by tempting them to evil. By doing this the devil gains more souls for hell and turns people away from God.
A lot of people say that Nazis are the perfect villain, because everybody hates them. You will never have a theater full of people getting pissed at how Nazis are treated. Well, pencil in Satan next to Nazis. Our default setting is to hate Satan. There is nothing endearing about him. Furthermore, he has a plus side over the Nazis—he is more interesting. Remember this is a character that according to most Judeo-Christian mythology is someone who was best friends with God before rebelling against him. Again, our default is to assume God is good and awesome. God created us, gave us life, and free will, so why would someone hate him?