Knox himself would likely be rolling over in his grave if he knew.
On a percentage basis, there were more practicing orthodox Presbyterians in Scotland when Knox was exiled to England in 1549 than there are in 2010.
This little parade would likely not bother him as much as the fact that his efforts didn't take, and that there are more practicing Catholics in Scotland today than there are practicing orthodox Presbyterians - and likely more than all varieties of Scottish Presbyterians combined.
Knox is enjoying being in the presence of his Lord and in comparison probably would not give one whit about the parade.