There is no specific mention of inter-religious marriages in Hindu scriptures. However it has been a common practice amongst Hindus to marry within one’s varna and jati to maintain good harmony with two sets of families.
Interfaith marriage is not only a marriage of two individuals but, in many respects, it is an union of two sets of extended families and communities. If two communities are at odds and have major historical conflicts, that may spill into every step of your planned married life. For this reason, parents and faith leaders from all religions wish their young ones marry a like kind person.
Many times it is not the religion but what that person has learned from it is important. A religious fanatic will certainly create unexpected problems in the planned married life, especially while raising children in two faiths. An exclusivist supremacist will want children to follow only their faith and not the other.
A Christian in love with a Hindu has to find out if he/she or your children will have to be a part of Hindu religious ritual practices and if that will be in conflict with fundamental Christian religious beliefs.
A Hindu in love relationship with a Christian should find out if raising children in two faiths is acceptable to the Christian intended spouse, more specifically if Baptism/Christening of children is expected. Baptism is not a hollow ritual devoid of meanings. It will set a religious tone for your planned married life and may have major legal consequences in a child custody battle during the divorce proceedings.
There are many other points to be discussed, including what will be names of children, if it involves mandated financial contribution to a church or mandir and what will be the final rite—Hindu cremation or Christian burial—for a family member.
Ideally it is good to share two faiths, truly respect each other’s beliefs and with equality.
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Other reading material: Book–Interfaith Marriage: Share and Respect with Equality
Relevant videos: Interfaith Marriage With Equality,
Contributor: Dr. Dilip Amin