@wellingtonrock

Christian version:

Some people believe they worship God when, in fact, they worship the Devil.

They are not so hard to distinguish: the real test is to look at what they do and check if it follows the 'do to others as you would have them do to you' rule.

Those are the distinguishing marks of a real christian.

Superhero version:

Some people believe they are superheroes when, in fact, they are truly the most despicable villains.

They are not so hard to distinguish: check if it they respect other people, and always give them a fair treatment and try to help them when in need, no matter who they are.

That's the litmus test of a real superhero.