From Khan v. Hasan, decided Wednesday by the New York intermediate appellate court (Judges Angela G. Iannacci, Cheryl E. Chambers, William G. Ford & Lillian Wan), a good illustration of how American law generally treats religious agreements:
The parties were married in a civil ceremony on March 2, 2016, and subsequently held a religious ceremony on September 12, 2016. The parties' religious certificate of marriage, which was signed by two witnesses and an imam, but was not acknowledged, lists an amount of $50,000 for "Meher." The parties assert that a Meher or Mahr agreement is an agreement between the parties to a marriage, in accordance with Islamic law, that the husband will pay to the wife a specified sum in the event of a divorce.
The parties eventually divorced, and the husband sought to set aside the Mahr; the court agreed: