Which of these teams have the most fans world wide?

You are talking partial truths: it's a well known fact that Franco was more a fan of Atletico (although in reality he didn't care about football, but Atletico was the team of the army), that's why Atletico won so many league titles during the early Franquism and Autharchy era.

However, it is also well known that Franco changed his support to Real Madrid when the Aperturism and Technocracy stage of his dictatorship started (1954), because he wanted to use it as the team of Spain and international propaganda and Real Madrid had a bigger fanbase and had a better team at that moment.

Please, it's quite offensive that you try to teach me spanish history.

I don't know much about Franco and Real Madrid, but here is a nice read.

http://real.theoffside.com/editorialopinion/whiter-than-you-think-a-history-lesson.html

paperbackwriter wrote:
From what I've read in this thread, Man Utd fans have been just as adamant about their club being the most supported as Madrid fans. But nice pun.

And lol at "stolen" trophies, considering what club you're supporting... Barcelona should still be at 1 CL victory if it wasn't for refs handing you games when it mattered in the last 3 "triumphs".

If you say it enough times, you might even start to believe it..
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Its a well known fact that the spanish government interfered with the signing of di stefano and real madrid only started to dominate football after they signed him, before him barcelona had won more trophies than real madrid.