Is Satan evil?

[Ryantology]

That millions of people accept Satan is real is a good reason to argue that he isn't real, not a good reason to argue he isn't evil.

I understand that it is interesting from a mythological stand point, the same way as anaylizing the Illiad or something but what can be the point in convincing believers that Satan wasn't that bad of a guy? To turn Christians into Satanists?

If you are shown that your good guy is, in all ways, much worse than your bad guy, why would you want to follow the good guy?

There's no reason to follow Satan, as Satan is never shown looking for followers (though, of course, some of them would anyway) and, as you pointed out, Satan's still not a good guy in any case. The best thing to do would be to walk away from the whole thing.