Anand, Unlike other religions, hinduism is a culture that we acquire by birth. Just as we cannot suddenly change our motherhood, the same as with the religion.
In that case, Ravi's birth is considered for determining his faith.
Why are you so adamant on supporting Ravi.. Ravi should accept the fact that his son would not be discriminated because he is born to a hindu mother.. ie his hindu wife..
Since the rituals are prescribed by Adi shankara itself, the tantri is right & clear in his point.
Please understand the diff b/w christianity & hinduism.. Guruvayur is one part of larger hinduism, and it has its own tradition.