The Wayne County Ohio Library website has a listing of early ministers who performed marriages in Wayne County. S.L. Collins is listed as a Methodist preacher, no date, with the notation under township location as "fm". I don't know what the "fm" means. I do think he was an itinerant circuit preacher.
From another source, I have that S.L. Collins was a Methodist preacher in "Fred's Circuit" in Wayne County OH in the 1840s. He married Mary Marie Helfer in Wayne County in 1840. The ceremony was performed by George W. Howe who was a Methodist Minister, in Wayne Co, in 1840.
The American Baptist Year-Book, 1870, has the following listed as an Ordained Minister:
Collins, S. L., Amazonia, Missouri [ note: Amazonia is a small town in Andrew County Missouri, north of St Joseph). S.L. Collins does not appear in the 1868 Baptist Year-Book.
We know that by about 1847 he was a Baptist Minister.