There is no such thing as a “gay Christian.”
There was, until the language was co-opted. You wanna mess with minds, tell 'em Paul wrote in the Bible that everyone should be a gay Christian, and when they incredulously ask where, tell 'em Philippians 4:4.
I would just say that there is no such thing as an unrepentant practicing homosexual Christian.
It’s a sin, and sin cannot be thrown in the face of God without consequence.