Kittypie070, you hit the nail on the head:
The operating system in which Linux became popular was basically the same as the GNU operating system. It was not entirely the same, because it had a different kernel, but it was mostly the same system. It was a variant of GNU. It was the GNU/Linux system.
As for GNU's own kernel, let's take the words from gnu.org itself:
The Hurd, GNU's own kernel, is some way from being ready for daily use. Thus, GNU is typically used today with a kernel called Linux
Doesn't that speak volumes?
Don't get me wrong, I'm glad that GNU and the FSF are there doing what they do. There's certainly some
extremely useful software and licenses put out there. Without Stallman this stuff probably wouldn't exist. The FSF does good things in court too. Stallman's views, even when extreme, forces people to think. In my personal opinion (which I'm apparently not alone in), you'd think a little more gratitude could be shown to Linux. Where would GNU be without it?