A born Christian girl brought up by a Hindu family married a Hindu boy as per shastric ceremonies. The marriage is:

Under the Hindu Marriage Act, 1955, the Act applies to Hindus by religion, including those who are born as Hindus or who have converted to or are brought up in the Hindu faith.

In several judicial decisions, it has been held that a person born into another religion but brought up as a Hindu and who adopts Hindu customs and practices may be treated as a Hindu under the Act.

In this case, the girl was born Christian but was brought up by a Hindu family and married a Hindu boy according to Shastric Hindu ceremonies.

Her upbringing in Hindu traditions and solemnization of marriage through Hindu rites indicate her acceptance of Hinduism at the time of marriage.

The law recognizes such cases where religious identity is determined by conduct, upbringing, and acceptance of customs, even in the absence of formal conversion.

Therefore, the marriage is valid.