orangepoindexte
Teh Orange One
The Juggernaut in the comic books is indeed Mystically Powered. He found the Mystical Ruby of Cyrottak (or something like that)... and read the inscription: Whoever touches this stone shall be the Juggernaut... and was instantly transformed into a superhumanly powerful and nearly invincible being.
There was a storyline where Juggernaut let Black Tom Cassidy touch the gem and in doing so, he lost half his powers to Black Tom and both were super-weak versions of the Juggernaut. It was in the final issue of Marvel Team Up back in the 80's as a matter of fact.
A little more info... Doctor Strange the Sorcerer Supreme has on MANY occasions employed spells containing Cyrottak's name as defensive spells/binding spells... so it's obvious the Cyrottak entity responsible for giving Juggy his powers is a real extra-dimensional entity similar to beings like the Vishanti and Dormamu... and that the ruby Cain touched was some sort of focused point of his powers here on earth.
The Ruby has also been shown to be capable of deflecting mystical bolts in a few What If...? storylines.
The movie version is total bullshit, as you'd expect.