Ephesians 5:11
And have no fellowship with the unfruitful works of darkness, but rather reprove them.
Some scholars insist that refers to former Christians who have deliberately gone way and persistently over the line into overt and rebellious apostasy.
I suspect that the homosexuality issue is seen by God as a massively intense, fierce test for the Church and believers. One that the Church and most believers are largely flunking on both sides of the fence, the narrow line.