I believe that every human being is not a Muslim, Hindu, christian and Sikh, these are made by us and god is one and only one & god known their name by respective to these casts.

All people are descended from Adam and Eve, therefore, all people are alike. There is only one God and He tells us how to worship him in the New Testament.

God has no trouble knowing each of us, he doesn't need a caste to do so. You are right--all these religions are manmade and God calls them vain, blind leaders of the blind. Read the Bible, it will tell you what God wants.