"Church affiliation" refers to one's connection or membership with a particular religious organization or group called a church. It implies being associated with a specific faith, beliefs, and practices of that particular church. Full definition
This figure was substantially lower (19 percent) for those who had no current church affiliation. (religion-online.org)
I am curious if you have a home church affiliation. (redeeminggod.com)
The first is the inclusion of church affiliation in what we refer to as «the American way of life,» Franklin D. Roosevelt, the primary spokesman for the American cause in World War II, articulated the four freedoms for which Americans were fighting; one of these was freedom of religion. (religion-online.org)