I would say the “Church” of Scotland is no longer a true church.
The Free Church of Scotland sounds more like the true heirs to the legacy of John Knox and the Scottish Reformation-
http://www.freechurch.org/index.php/scotland/
The Church of Scotland has been apostate for a long time now. I don’t know much about the Free Church, but last year I listened to a sermon by one her ministers and it was full of biblical truth Knox could Amen.