The Confusion of the Law in India

In India, most marriages are not registered. So it's presumed to be a valid marriage unlike many other countries. It's common across India for couples to just go and not even perform the legally recognized saptapadi. But if society accepts you as married, then that's good enough. What else is marriage if not primarily a social stroke religious institution? And if it's accepted by society and it is capable of functioning beyond religion, in a secular space, then there's no such thing as 'gay marriage'