As long as The temple Tantris do the same purification for the entry into the temple of the children born to a Brahmin/Christian couple marries then they cannot be accused of Brahminical arrogance. Rules are same whether the children born to Ezhava/Christian couple or Brahmin/Christian couple.
Also, Unlike other religions, Hindusim doesn't recognize conversions from other religions, nor evangelical spread of the religion. You are either born into it or not, thats it. Individual beliefs are totally out of this.
So, Ravi is just playing to the gallery. If he is so sincere Hindu, he need not go to temple, for the mistake he committed by marrying a christian. God is everywhere and he can still prey to god even from his home.
