Quick answer, no. Neither of us have ever been part of a denomination.
However, this does not mean we are "anti-denomination." We have close friends who are part of denominations. Some of our board members are part of denominations. And we have worked closely with people who belong to denominations.
While neither of us has ever been part of a denominational church before, if we found an association that we felt was an incredible fit, we would not be opposed to joining it.

