Alliance Defending Freedom (ADF), which represents religious conservatives opposed to same sex marriage, says that "These cases are unprecedented in their potential impact for the future of marriage in America. Watch this video to learn the timeless truth about marriage, the background and importance of DOMA, and what's at stake when the High Court goes to hear arguments over these cases in 2013!"

According to its video, "Marriage is a personal promise with a public purpose," referring to children born of the union of one man and one woman. "DOMA doesn't stop individual states from debating marriage," the video goes on to say. "Our history books do say something about marriage. They tell us that other groups have tried to redefine marriage before, like polygamists in the 1800s, racists in the 1900s, and of course, same sex activists today.

ADF has also issued a prayer guide concerning marriage, which states:

Praise God for the impact of Marriage:

• Thank Him for how marriage refines our character, creates stable community for the birth and nurture of children, and unites men and women in an enduring whole-life union.
• Thank Him for giving the distinct, irreplaceable gifts a mom and a dad each uniquely bring to children, through marriage.

Pray for the marriages in your community:

• For healing, restoration, and divine protection over the relationships between husbands and wives in your church, neighborhood, and among your friends and family.
• That Christians will hold fast to the biblical Truth about marriage and boldly stand up for children, who are most protected and impacted by marriage.

Pray for the future of Marriage:

• For the nation to uphold the truth that marriage between one man and one woman is the foundation of society and the best environment for raising children.
• For Americans to remember the damage already done to marriage in our society, and how that has hurt children.
• Pray for the judges hearing marriage cases – and specifically the Supreme Court Justices – to rule with wisdom and discernment to protect marriage.

Pray for God’s design for sex and sexuality in Marriage:

• Pray for sexual purity; that sex will be reserved for marriage, and celebrated in marriage.
• Pray for God’s blessing and restoration on those hurting and suffering from going outside of His design for sexuality.
• Pray for sexual fidelity and faithfulness between husbands and wives.
• Pray for children’s innocence to be protected from false sexual indoctrination in schools.