IC 31-11-11-7
Solemnization of marriage between persons prohibited from marrying
Sec. 7. A person who knowingly solemnizes a marriage of individuals who are prohibited from marrying by IC 31-11-1 commits a Class B misdemeanor.
As added by P.L.1-1997, SEC.3.

Worried about the government forcing your church to perform marriages? How about making it criminal to even perform a marriage? Nice, huh?