McFarlane/McFarland/McParland and other variants is a quite common surname in Co. Tyrone. In the 1901 census, there were 134. The name, the main denominations and general location all suggest they are descendants of plantation settlers from Scotland in the 1600s. This website gives you a little information about the surname, based on where they were found in Ireland in the mid 1800s:
Here’s the 1901 census for Faccary with 9 McFarland households:
They are a mix of Church of Ireland, Presbyterian and Methodist. Methodism only really got going as a separate denomination in Ireland in the mid 1800s and if researching folk born in the late 1700s you can assume those families would have been Church of Ireland then. (There are no Methodist baptisms in Ireland before about 1818 and no marriages before 1836).
There were 2 McFarland households in Liscabble in 1901 (1 Presbyterian & 1 RC):
Those 2 families appear to beside each other and so may well be related. A mixed marriage at some point may explain the different denominations.
Griffiths Valuation for 1860 shows where there were McFarland properties in the two townlands then, and you can use the contemporaneous maps on the site to work out where they are today.
Bodoney Lower has Church of Ireland records from 1812. There are 3 Presbyterian churches in the area but none has any records before 1843. RC records start in 1865.
Cappagh has Church of Ireland records from 1753; Edenderry Presbyterian from 1845 and Mountjoy Presbyterian from 1821. RC from 1843.
Copies of all those church records are in PRONI (and the RC are also on-line on the nli site).
Research before those dates may prove difficult due to the lack of records.
If you haven’t already come across it, this Co. Tyrone site contains details of literally hundreds of McFarland entries. You may find it helpful: