No...not at all.
As you do unto others....do you not expect as much in return?
Perhaps you don't believe in heaven or angels....
But you'll see.
And they will do unto you, as you did unto others.
What's unfair about that?
It is more a matter of being shameful than unfair, actually.
Propaganda from some misguided people aside, the Golden Rule is both more ancient, more sound and morally superior to the mafia blackmail tactics that some people swear to be the will of God.
Let's not waste any time with such poor propositions.