Point was trying to make was that just cos not in OPR or Catholic Registers didn;t mean it hadn't happened. I've found several not in OPR but in Kirk Sessions (Free, UP and Presby)
You are quite right. But even though there was unrest before 1843, none of these churches actually existed, and therefore there are no records of them, before 1843, and the original query relates to a marriage in 1824.
Also the Church of Scotland, Free Church of Scotland, United Presbyterian (UP), Free Presbyterian, United Free etc etc are all Presbyterian. There is no denomination in Scotland which calls itself simply 'Presbyterian' because that term already applies to the Church of Scotland.
The main Christian denominations in Scotland that are
not Presbyterian are the Roman Catholic and Episcopalian churches, and there are some surviving registers of these denominations which do contain information aboute events before 1843.
There are also some more recent ones like the Baptist Church, Congregrational Church, Society of Friends (Quakers), Latter Day Saints (Mormons), Jehovah's Witnesses, an assortment of Brethren (Close Brethren, Open Brethren, Plymouth Brethren) and various evangelical groups (Church of the Nazarene, Church of Christ etc) who may or may not be organised on a tiered committee system resembling Presbyterianism. However all of these are irrelevant in terms of a query about an 1824 event.
I wish I could find that diagram of the splits and recombinations of the churches in Scotland - it used to be on the web site of St Nicholas Buccleuch Church in Dalkeith but it has disappeared and a Google search failed to find it.