1. Under sec 5 of Hindu marriage act, a marriage may be solemnized between any two Hindus, if the following conditions are fulfilled, namely:-
(i) neither party has a spouse living at the time of the marriage;
(ii) neither party is an idiot or a lunatic at the time of the marriage;
(iii) the bridegroom has completed the age of twenty one years and the bride the age of eighteen years at the time of the marriage;
(iv) the parties are not within the degrees of prohibited relationship, unless the custom or usage governing each of them permits of a marriage between the two;
(v) the parties are not sapindas of each other, unless the custom or usage governing each of them permits of a marriage between the two
Out of the five above conditions, this article refers to the condition stated under section 5(v), which states that if the Hindu bride and the Hindu groom are "sapindas" of each other, the marriage between the two cannot be solemnized by law and will be legally void.
2. Therefore, it is essential that Christian party converts to Hinduism before marriage.
3. Conversion to Hinduism can be performed by visiting any Hindu temple. Arya samaj temples also performs this ceremony.
4. Sec 8 covers - Registration of Hindu Marriages :- (1) For the purpose of facilitating the proof of Hindu Marriages, the State Government may make rules providing that the parties to any such marriage may have the particulars relating to their marriage entered in such manner and subject such to conditions as may be prescribed in a Hindu Marriage Register kept for the purpose.