French,
Now you are putting spin on the ball !
I will start off with the term "Ancient Parish",
Each parish had one church. ( A bit "chicken and egg" here)
Broadly speaking each county was made up of a number of parishes, which did not span county borders ( Bound to be an exception somewhere, sometime)
Now this church would be Anglican/Church of England.. Henry VIII etc..... with at times no churches of other denominations... banned for e.g. Gunpowder Plot etc.
For a period up to July 1837 the only LEGAL way to marry in England/Wales was in a CofE church ( Jews and Quakers were excused from this mandatory rule)
So say in 1830, there were Catholic Churches, which would/could baptise RCs and bury them, but barred from marrying them.
Some Catholics, and Methodists, Presbyterians etc, either
married in the "wrong" church, or lived together without marrying ( the resulting illegitamacy brought complications for hereditary angles and stigma, etc.) or went "abroad" to marry in a country that did not have this restrictive law...
SCOTLAND.
But the 1837 Marriage Act changed these measures, permitting marriages to take place in any place of worship or a Register Office.
As populations grew and shifted, the parish felt the need to build "outstation" churches, usually small ones, in the required places. These called chapels "of ease".
Again to do with need of populations, some of these satellite churches got their independence from mother.
In my home are area. St Mary the Virgin at Horton parish, gave birth to a chapel of "ease" at Blyth.. St Mary's.
(St Mary's, Horton itself, had once been a chapel of ease, under the sway of St Mary the Virgin at Woodhorn)
St Mary's, Blyth ( now in middle of rapidly developing town)
became an independent parish.
Today St Mary's, Horton stands alone in a rural area with hardly any people living about it.
The word "Parish" to researchers, is a sort of jargon, meaning the area of land administered by a Church of England church. So "Parish" = CofE
The areas administered by churches of other religious demoninations were then not referred to as " parishes".
I knew that the RC Church decided to tread carefully after laws were relaxed... and so avoided dedicating their churches to the same saint as the CofE had done. And they avoided the term "parish". Todau of course is now different.
In some libraries/archives today, you might see shelves, drawers labelled up " Parish Records 1650-1870" and others " Other Denominations" or "Non-Conformist Church records" etc.
Now bear in mind, the above is but a crude summary of something that was complicated and evolved through history... I have book called "A thousand years of the English Parish" ( by Anthea Jones) and it is 330 pages long!
The size and number of townships were not set by rules, but by need
There is a photo of St Michael's H-le-S "parish" church on that Genuki site I listed earlier.
Michael Dixon