Being a foreign citizen, that too a Christian, you need to observe the rule meant for marriage under foreign marriages act 1969.
Section 4 of the foreign marriages act, 1969 states that :
Conditions relating to solemnization of foreign marriages - a marriage between parties one of whom at least in a citizen of India may be solemnized under this Act by or before a Marriage Officer in a foreign country, if, at the time of the marriage, the following conditions are fulfilled, viz - a) neither party has a spouse living, b) neither party is an idiot or a lunatic, c) the bridegroom has completed the age of twenty-one years and the bridge the age of eighteen years at the time of the marriage ; and d) the parties are not within the degrees of prohibited, relationship.
Provided that where the personal law or a custom governing at least one of the parties permits of a marriage between them, such marriage may be solemnized, notwithstanding that they are within the degrees of prohibited relationship.
Submission of notice of intended marriage
At least one of the prospective bride or bridegroom must be an Indian national and a legal resident within the jurisdiction of the Consulate. If any one of prospective bride or bridegroom is not an Indian national, a No Objection Certificate from the concerned authority or an affidavit declaring his/her marital status and willingness to marry an Indian national, duly attested by the concerned authority need to be submitted. Three witnesses who are Indian nationals must be physically present along with the prospective bride and bridegroom at the time of submission of notice of intended marriage.
. Required documents:
Completed "Misc. Services" application forms with one passport size photo affixed in the box.
Fill in all the information correctly. Incomplete application will be returned without service.
Original and one copy of identification pages of the passports of all the five individuals.
Copy of Proof of address (utility bill, driver license or lease agreement).
Copy of valid Visa/Green Card for Indian citizens and for other citizens of Indian origin attach a copy of their OCI card/PIO card/Renunciation of Indian Citizenship Certificate (if applicable).
Notice of intended marriage (4 copies) (Form-I).
Declaration by prospective bride and bridegroom in duplicate (Form-II).
Sworn Affidavit by prospective bride and bridegroom in duplicate.
Four identical, passport size, recent, photographs each of prospective bride and bridegroom.
Fee $50 and $3 for ICWF.
Fee is to be paid by cashier’s check or money order drawn only in favor of "Consulate General of India". There should be a seperate cashier's check or money order for ICWF Fee. Cash payment is also accepted at the counter of the Consulate. Applicants are requested to come with exact change for efficient services.
Personal checks, Debit cards and Credit cards are not accepted.
If application is being sent by post please sent a seperate $20/- cashier’s check or money order fee for return mail. No prepaid envelopes are accepted.
Solemnization and registration of marriage
Three witnesses who were present at the time of submission of notice of intended marriage should be present at the time of marriage solemnization and registration.
All the five persons must present their original passports at the time of marriage solemnization and registration.
The three questions are answered above, the fourth one cannot be answered because it depend on the law of the country in which you may like to settle down.