Marriage is a personal choice to take part in a social and (usually) religious custom. It is ridiculous to claim that the government has any role in such a choice.
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The government has no place in marriage. The decision to be married should be made by two or more consenting adults without any government involvement or interference. Religious institutions each should be allowed to define a legitimate marriage in their own ways and reserve the right not to join together those they believe are not legitimate.
There are many complication and trouble in marriage. Things like adultery, bigamy, domestic violence , child abuse come from marriage and cannot be dealt with personally. Law is needed to deal with these issues. And divorce is a thing that specially needs legal attention. Hence marriage must come under the purview of law.