I haven't personally tested this belief, but from what I have studied, I believe that if you take only the very, very best and greatest teachings from the greatest, most enduring religions known to to man the teachings will fit together so seamlessly that it will sound like they were all stated by the very same person.
That's something to consider!
If true it says something very important alright
God in His many disguises
THE KAABA STONE FROM MECCA
AT THE CENTER OF A GALAXY
My Photoshop Creation