Douglas Harper's Etymology Dictionary
Wiktionary
a. Who does not generally attend church. alt. Who does not generally attend church.
Wikipedia
"Unchurched" (alternatively, "The Unchurched" or "unchurched people") means, in the broad sense, people who are not connected with a church. In research on religious participation, it refers more specifically to people who do not attend worship services. The Barna Group defines the term to mean "an adult (18 or older) who has not attended a Christian church service within the past six months" excluding special services such as Easter, Christmas, weddings or funerals. Barna reports that there were 75 million "unchurched people" in the United States as of 2004.
Usage examples of "unchurched".
You could use Ray Dalke because he was willing to sacrifice the unchurched, so long as he was saved as one of the elect, immortal headmen in the kingdom of God.
In January, 1897, he gathered about him a few leading men and women of the race and organized a church in Northwest Washington, in the midst of a large unchurched population.
Simeon of Cambridge had previously set the example of caring for the unchurched population by his personal labors and the outlay of his large private fortune.
It has unchurched millions, is still unchurching at a tremendous rate, and will end by unchurching itself.
The unchurched all looked alike to Sandy, differing only in the details of their dress, modes of transportation, and to what extent the curia allowed interaction with them.
The unchurched in the valley tried for a few hours to pull their boats up onto the shore, but the muddy expanse between the water and their lurching docks grew too quickly.
Shed B, early summer had been revoked and what one met at the door was the dank cold of a hunting camp when you arrive in November, the stove in the middle of the room as dead as an unchurched god.
God to his parishioners, his family, the unchurched, society at large, and, last, the self, and not the other way.