Just 17,819 records in this early survey conducted by the government of Ireland to determine the religious affiliations of the population. Only a fraction survived the destruction of 1922. Records typically include the name of the individual, place of residence, and religion.
The census recorded the number of individuals affiliated with each of the major religious groups in Ireland, including the Church of Ireland (Anglican), the Roman Catholic Church, and the Presbyterian Church. It also recorded the number of individuals who were not affiliated with any particular religious group.
There’s more detail at https://virtualtreasury.ie/gold-seams/1766-religious-census/.
I occasionally get comments that this kind of database is deplicating what’s available elsewhere, particularly if that elsewhere does not require a subscription.
Perhaps you remember the days when there were no supermarkets. Shopping required stops at the butcher, baker, grocer, greengrocer, fishmonger, cheesemonger, and perhaps the chemist, each with a queue until you could be served. And there was the queue at the bank, during banker’s hours, to get the cash you needed to pay. Supermarkets provide a one-stop for all those, and it’s the same with the major genealogy websites.