Mich. Comp. Laws § 551.16

Sec. 16. A marriage solemnized before an individual professing to be a district judge, common pleas court judge, district court magistrate, municipal judge, judge of probate, judge of a federal court, mayor, the county clerk or, in a county having more than 2,000,000 inhabitants, an employee of the county clerk designated by the clerk to solemnize marriages, or a minister of the gospel or cleric or religious practitioner shall not be considered or adjudged to be void, nor shall the validity of the marriage be affected, on account of a want of jurisdiction or authority by that individual if the marriage was consummated with a full belief on the part of the individuals married, or either of them, that they were lawfully joined in marriage.