Notwithstanding any law, usage or custom to the contrary no marriage contracted whether before or after the commencement of this Act between two persons being at the time of the marriage Arya Samajists shall be invalid or shall be deemed ever to have been invalid by reason only of the fact that the parties at any time belonged to different castes or different sub-castes of Hindus or that either or both of the parties at any time belonged to a religion other than Hinduism.