M. G. is the usual abbreviation for Minister of the Gospel, so it could be most any denomination.. Catholics are usually married at the church that they were baptized in, if different it was always at the local church of the bride. I have one couple that were both baptized at the same church in Germany but married in St. Boniface in St. Louis. There was a letter from the church in Germany to St. Boniface stating that the couple were baptized there, a requirement for Catholic marriages. If one
of the parties was not a Catholic, there was usually a signed document in the parish records from the non-Catholic promising to raise any children born to the marriage in the Catholic faith. Guess you would have to do a search for L. C. Ransom to find out which church he was a minister at.