During the process of organizaning any religion,concept,belief,ideas,norms,rules and regulations are born, and these things do nothing but add extra burden on human minds. Because of such burdens, mind never become free to meditate. The mind always get attached with such man made coditions mentioned above(concept itc.) A mind has to be free of all the conditions to realize God, and this is what the Eternal Religion has been talking about. Why Buddha did not want to talk about God? Becacuse he did not want his deciples to get attached with the even God. He knew even the attachmet with God or a desire to find God can be a barrier to Nirvan.