90% of indian marriages are arranged. arranged marriages by definition happen with in the same caste (and rarely among friends families).

I am willing to bet, 100% of non-arranged marriages are outside of caste/religion. The dating scene is still in its infant stages, you can expect more inter-caste marriages when arranged marriages decline.

I want to point out that prevalence of same-caste marriage does not automatically translate to caste based discrimination.

For example, I am open to marrying other caste person, but if other caste persons are not willing to marry me (for whatever reason), and I end marrying in my caste. does it mean I discriminate others based on caste ?

if a white person marries another white person does it mean that white person is racist?