Mr.Saurabh:
Your last post is as old as 10th June 2011. But since you say that no one has satisfactorily answered your question “let me make a try”. It is also possible that your question has no clear answer. Under such circumstances one has to go by precedents, if there are, or by court decisions.
At the outset itself let me say that there is no clear answer to your question. But knowingly suppressing relevant information to achieve something, which otherwise one is not eligible, is a criminal offence punishable under law. Whatever he achieved can also be undone.
First of all, among Hindus caste is decided by birth i.e. by the caste of the parents. So no conversion from any caste to any other caste is possible. If someone says that he got converted to a lower caste and gets a caste certificate, it would be a false certificate and he can be punished. In this forum itself some members had asked whether in an inter-caste marriage, if only one of them belong to a scheduled caste, his or her spouse or their children can claim benefits of scheduled caste. Here also there is no enacted law. Hindu scripttures deal with the subject. But the scripttures have been superseded by our Constitution. So one has to go to court if one has, for any reason, to decide on one’s own caste. Some persons have gone to court and courts have given varied decisions. I do not know whether there is any decision of the Supreme Court, so that it can become a case law.
Now what about conversion to Islam? If one gets converted to Islam, gets a certificate, he has to be considered a Muslim in the normal course of things. But I don’t think that there is a practice of giving certificate of conversion in Islam. If one does not disclose his conversion and continues to live as Hindu and the Aligarh Muslim University denies him a post reserved for Muslim, one can go to court. But it is not likely that courts will decide on their own. They may examine Islamic scholars presented by both sides. I do not think that Aligarh Muslim University is bound to abide by such decision.
A Hindu cannot contract a second marriage, when the first spouse is living, under the anti-bigamy provisions of the Hindu Marriage Act. But under the Shariat law a Muslim can have up to four wives. Many well known Hindu celebrities have adopted this trick to contract a second marriage. They will not publicly announce their conversion and will retain their original Hindu identities for all legal and public purposes, except if their second marriage is questioned or they are sued.
So far there are no reservations for Muslims. Late Mr. Y. S. R. Reddy, then Chief Minister of Andhra Pradesh, introduced reservations for Muslims. But it was shot down by the High Court. Reservations for Muslims can still come. But even then it is most likely that it will be only for backward Muslims.
Now what about conversion from another religion to Hinduism? One has to be born as a Hindu in a particular caste. But had it been so always? Before the arrival of Islam and Christianity into India there was no concept of religions as we have today. There were religions like Buddhism and Jainism. But they were mostly considered as professing certain opinions and there were free migrations among religions. Jains live like Hindus and even go to temples. Even fanatic Buddhists from Sri Lanka go to temples in India like Guruvayur. The temple authorities do not object either. Many who came into India through the Khyber Pass like Alexander the Great, the Sakas and Hunas were not Hindus. But after generations not only they became unidentifiable from other Hindus, but even successfully claimed themselves to belong to upper castes. Rajputs, who claim they to be Kshatriyas are believed to be descendants of Hunas. At the time they entered into India, they were referred to as Yavanas. But over generations they lost their Yavana identities.
Chitpavan Brahmins and Bane Israelis of Maharashtra are supposed to belong to the same race, which migrated from the Middle East. It is possible they were Jews before coming to India or were converted to Judaism after coming to India. But how some became Brahmins? Chitpavan Brahmins are very orthodox.
Now there were some interesting cases. As you may know Ms Indira Nehru, a Brahmin married Mr. Feroz Ghandy a Parsi, though as per Vedic rituals, and became Mrs. Indira Gandhi. Decades later the temple authorities of Jagannath Temple at Puri did not allow her claiming she was not a Hindu. Some years later she petitioned the Supreme Court, which decreed that she was a Hindu. Did the Jagannath Temple authorities comply with Supreme Court decree? We do not know, because afterwards Madam Gandhi did not go to that temple.
Singer Yesu Das, a Christian, was an ardent devotee of deities at Guruvayur and Sabari Mala. He has sung many songs in praise of the Lords. But when he wanted to enter Guruvayur temple, he was not allowed. No court can enforce its law on Guruvayur temple. Very recently Meera Jasmine, a well known South Indian actor and a Christian, entered a temple in North Kerala in cognate. Later the Temple authorities found out and decided to “purify” the temple. Meera Jasmine, on her own, gave Rs.10000/- for the purpose. The temple authorities demanded another Rs.15000/- and she paid that also. I don’t know how the amounts were accounted or were accounted at all. Who can question God? Even in the case of Satya Sai Baba no authority has asked for account of crores worth currency notes, gold and silver found after his death.
The temple at Tirupati was earlier allowing non-Hindus also and many celebrities have entered the temple. But some years back they decided not to allow non-Hindus.
Until the arrival of the British there was no continuity of an established law and legal system. There were intermittent empires and the emperors established some kind of legal system. But empires were dynasty based and no dynasty survived more than two or three centuries. In between small chieftains will capture power splitting the country into a number of kingdoms, each one having a legal system dictated by its ruler. Of course religions played an important part in the matter of continuity of laws. But they were also manipulated by the rulers to serve their selfish interests.
In conclusion there are things, which no law can throw light on. If you have comments or further questions, you are most welcome.