Methodism took a lot longer to become established in Ireland as a separate denomination than in England. In Ireland there was considerable resistance to separating from the Church of Ireland. It was around 1818 before Methodists started to conduct their own baptisms. However because of continuing loyalty and other factors, many continued to use the Church of Ireland for baptisms for years after this and it was 1871 before all Methodists routinely performed their own baptisms.
For Methodist marriages, the earliest that I am aware of, date from 1835 (Belfast Donegall Square, the first Methodist church in Ireland). However in the mid 1800s there were only a few Methodist Ministers (Methodism relied heavily on lay preachers). So that shortage led to the continuing practice of marrying in the Church of Ireland. In addition, in the early years, many Methodist Meeting Houses were not licensed for marriages so that too contributed to couples marrying in the Church of Ireland.
So to summarise, you are unlikely to find many Methodist baptisms before 1820. Few marriages before the 1840s and only a handful for many years after that. If there are no Methodist records in the location you are researching, search Church of Ireland records instead, as that’s the most likely place to find the relevant event.
In the case of Magheracross, there are 2 Methodist Meeting Houses. Ballinamallard has baptism records from 1829 and marriages from 1882. Knockmanoul has baptisms from 1879 though there is a note in the PRONI (public record office) guide to say there may be some earlier ones in circuit book ref MIC1E/15. In other words, a travelling Minister kept his own records rather than the information being recorded in a book in individual Meeting Houses. Knockmanoul has no marriages at all (the inference being they married in the Church of Ireland).
In a nutshell, I would say that your Gorrell ancestors were highly likely to have been Church of Ireland in the 1700s and at least until 1820. (And most of them still seem to have been Church of Ireland in 1901).
Not many Methodist Meeting Houses have graveyards and so Methodists may be buried in public or Church of Ireland graveyards (which are open to all denominations).