1. There is no clause in Indian law that forbids an Indian man (or woman) from marrying a Pakistani national.
It is not illegal for Indian to Marry Pakistani according to Indian Law.
Pakistan Nationals can visit maximum 5 places in India on Visit Visa and the same can be requested on their visa application form.
Attested Sponsor ship certificate is required only for Visit visa. Pakistan Nationals Entry & Exit point should be same.
2. If you would like to marry him in USA, you can very well get your marriage registered before the Indian high commission/Embassy at USA under special marriage act, by complying with the formalities.
3. Any foreigner marrying an Indian, the marriage will be registered under Foreign marriage act or special marriage act.
You can get married in USA itself and get it registered before the Indian consulate within your jurisdiction under specie marriage act.
4. A visitor visa is issued to a Pakistani national to meet relatives or friends or for any other legitimate purpose valid for a maximum of five specified places and for a period not exceeding 6 months with the stipulation that continuous stay during each visit shall not exceed three months.
Visas for foreign nationals with Pakistani Origin will be issued as per the details given below:-
Foreign nationals of Pakistani origin married to Indian nationals and their children may
be granted ‘X-2’ visa for a period of 5 years at a time with multiple entry facility.
5. There is no provision in law to adopt a formal procedure to convert into Hinduism, however you can get yourself converted to Hindu before any Arya Samaj in India.