When humans existence was there on the earth , they believed in One that is Almighty. Could you say , at that time there was Religion? No humans worshipped one God. Time went on,,,,....... religion era was back . First Hindu was there in existence . But after that Dividing went on . Then religion of Islam , after that Christianity and many other religions you can also see all these religions were due to Humans . Thus Humans are the sole creator of Religions. And if God would have created it then he would have put a stamp mark in back of everyone whom he would send to Earth.