Religion????What the F*** is that??

the most weirdest invention of the man is a concept called religion......If you born in one religion you are bound to follow the religion....If Necessity is the mother of invention, what was that necessity that a man had to invent such a wired concept? And why people of one religion think that it is the best religion and other religions are just so so.....why people ask you surname to check you are brahmin or chamar or mahar or mang or vani or muslim o r dont know which caste??? why do people find pride in caste??why do we marry on the basis of religion??why we r either burried or burnt on the basis of religion??? why people of different religion think so equally of other religion???why dont we have brain????