How Can We Defend the Claim That Marriage Was Created by God?

Questions about how to defend the claim that marriage was created by God and what to say to someone who doesn’t want her daughter to grow up Christian because she thinks Christianity is harmful to women.

• How can we defend the claim that marriage was created by God if marriage has been in non-Judeo-Christian civilizations throughout time?
• What should I say to someone who doesn’t want her daughter to grow up Christian because she thinks Christianity is harmful to women?