Religion and slavery are incompatible.

This condition obtains even where there is no slavery in the legal sense. It is found where as in caste system, some persons are forced to carry on the prescribed callings which are not their choice.

Slavery does not merely mean a legalised form of subjection.
It means a state of society in which some men are forced to accept from others the purposes which control their conduct.

The basic idea underlying religion is to create an atmosphere for the spiritual development of the individual. This being the situation, it is clear that you cannot develop your personality at all in Hinduism.

The teachings of Buddha are eternal, but even then Buddha did not proclaim them to be infallible. The religion of Buddha has the capacity to change according to times, a quality which no other religion can claim to have...Now what is the basis of Buddhism? If you study carefully, you will see that Buddhism is based on reason. There is an element of flexibility inherent in it, which is not found in any other religion.

religion is for man and not man for religion