By way of correction, the LDS indexes do not have all the info. off the marriage certificates. You would need to order reel/s of microfilm of the register and read it at a Family History Centre.
Marriage Registers in the IOM have the father's name of each party, with occupation &c ONLY from 1849 (except Lonan which begins earlier.)
The registers from 1757 - 1849 give the parish of residence & condition of each party, + names of witnesses. No parents' names.