The pious objectives with which our fore-fathers decided and embarked upon the framing of the Constitution - Secularism was one of the guiding principles. Secularism entails not just religious but also casteless egalitarian society. The high objective and the final goal was to convert a society fragmented on the lines of religion, caste, economic status etc into a homogenous society where identification of a person was not on the basis of the religion he professes or caste he belongs to but was on the basis of what he is or what he has made himself into.
Caste cannot be a class to define "Backwardness"If caste is the only ground for Social Backwardness, how can giving jobs or education will remove social backwardness. As evident in Southern India, the members of royal families, ruling classes, land-lords, and rich businessmen are considered to be backward by the Government because of their castes. They were kings and rulers for generations, and if the backwardness because of caste could not be removed, how could it be removed now?
There are several analytically significant differences between "Caste" and "Class”:The membership of a caste is hereditary or by birth which is not so with a class.
Caste is a closed group characterized by endogamy, while class is an open group which one automatically joins when one shares a common situation with other individuals.
There is vertical mobility in class so that a person can move up to a higher or go down to a class considered lower in social hierarchy; and there is horizontal mobility also as one can cease to share a common situation with one group of individuals and start doing so with another group. There is no such mobility in caste.
A class can generally be distinguished from another class in terms of some economic criteria, e.g. income, occupation, ownership of land or other means of production, place of residence (e.g. slum dwellers). While some castes may have a traditional or hereditary occupation, they are basically nothing having in common.