So, if you're not arguing that they're the best in the world, why argue that they aren't World Champions? Call me crazy, but isn't being the best in the world the exact qualification for being a World Champion? :dunno:
Do they have to beat every single football team in the world in order to make that title acceptable to you? Because, they beat every single football team in the world, no matter how you want to look at it. It just so happens that all of the football teams play in the NFL. Yes, there are other football leagues (Australian rules, Canadian rules, etc) but American football can only be found here in America.
So, what's your argument now? Do you want other countries to put together rag tag teams (with no chance of winning) to compete against NFL clubs, just for the sake of being able to say that the Saints played football teams outside of the US?