It grieves me to see people who try to limit God’s impact to their own clique. People who have the Holy Spirit can sometimes sense others who are brothers/sisters in the same Spirit. I am in a non-denominational church but I am certain the Spirit has told me that others are committed and believing Christians who also happen to be Baptists, Catholics, Pentecostals, Church of Christ and other.
It’s not what’s in the church. It’s what’s in the believer. Jesus knows His own and I would never limit Jesus to only one denomination. HIS denomination is those who accept HIM as their personal savior and ask the Holy Spirit to live within them. I don’t think He cares which pew you sit in.
I find it hard to believe that people don't find denominationalism sinful. Jesus prayed for the unity of the church.
If you accept this concept the remediation is to acknowledge that the church belongs to God and it is not ours to carve up or redefine. That is the reason the congregations of the church of Christ take the positionthey do on denominations.