CAN U ANSWER ME PLZ??

I always have one question in my mind, As everybody use to say that People themselves created Religion. 
But if we have a look/view on our History or have a review of any Religious Book, Every book explains 
abt some PROPHET, GURU, DEVS etc. But the question is Who created all these Personalities on earth?

Den How can we say people their self created Religions??
                                                      If there is only 1 Supreme power(Almighty) then Y there is creation of
All angels, Supernatural powers, who tells different ways , How to praise GOD.
Y all angles, Gurus preached their respective Rule & regulations of a particular Religion?
                                                      Y cant we obey one single Almighty?