Why people are digging against each other by beliving and living for caste & religion?

God has no caste and no religion, but in the form of caste and religion there are several God, God is common and father for all the people in the world, if so why the people who believe God or digging bit against other fellow men life as seeing their own life protection and welfare and neglect others life freedom? For example, there are lot of poor people in the higher caste but even the government never worry about their life and freedom, some people may be rich in the some caste that including in the lower caste, a rich man in the higher caste never mingle with the poor man in the same caste, like wise a man who live for the religion also does the same thing, if it is the case what is the use of human who live for caste and religion is trying to kill the minority people life by saying that their God is true God? their caste is true and their religion is true, do they all forget before the child came out from it's mother womp the child name is as child , and it does not have any name, caste, religion, the same thing happen when the man or woman died, at the burial ground nobody mention that cremate my father and or bury my wife life like that, they all almost say like this that cremate or bury the (dead) body. if so why the world leaders, nations leaders like India encourage and support the evil of caste and religion? In fact everybody has clear mind and observation that the caste and religion never bring happiness to the world? So does God loves the evil of caste and religion? certainly no one knows what caste the God is or what religion he is, if so why the people are drinking the innocents people blood in the form of caste and religion? for example the resent terror attack at Mumbai which killed many innocent people lives and draw their family to the streets. So is it necessary to this world to support such evils should spread in the world more and more here after?