Should the Catholic Church still have a say in political matters, like laws about marriage and education?

No, no religious institute should have a say in matters of the state
Be it majority of minority

Church must talk of religion and state must talk about administration, including marriages and education

The Catholic Church should only have a say in regards to matters relating to Catholics. I am all for India becoming a Hindu Rashtra and Bharatiya Plurastic society. Once this comes, the Catholic Church should not have any political matters. Only matters regarding Catholics.

Yes, they can propose laws to their own people, this will be decided by a vote