On the serious side: I don't know about the devil or god for that matter but man has forced a particular story on innocent people and basically told them, "This is how you should live", and if you will not follow that path then you're not worthy to be here.
On a lighter not so serious note:
God(?) supposedly knew we would do bad stuff but he or it didn't nip it in the bud after Adam and Eve's famed bonking under the tree.So what did God give us the reproductive bits for?
Blame it on the snake.(Trust in me!)
"Oops!" exclaimed God.
They can't believe in something invisible.
So Jesus is born
Does a lot of preaching
Turns water into wine.
Feeds thousands with a couple of loaves and a few fishes. (I couldn't even satisfy a family of five with that).
Well, as they say; The rest is fiction.
Even the believers can't decide what version of the story they like so what's the answer?
Give us all the religions at once.(What a fabby idea)
On a personal level, I think some of the belief systems have a lot to answer for and if it is the devil's little joke, then depending how you look at it, it's either very depressing or highly entertaining.