I contend that Molecule Man is THE most powerful being in the Marvel Universe (except for the Beyonder). I am in the process of going through my old comics and I was re-reading some Secret Wars. In secret wars II #6, Uatu says (talking about molecule man) "he is mightier than all other beings in the multiverse". While he says this the background shows death, mephisto, in-betweener, eternity, one-above-all(celestial) and even Living Tribunal. Uatu also tells Molecule man (talking about the beyonder) "You alone might stop him." Later in the same comic Kronos, Death, Chaos, Order, Eternity, In betweener, one above all, Gardener, Death and The Living Tribunal all appear and beg beyonder not to kill death. Beyonder ignores them and does it anyway (no one even tries to stop him because they know they can't). So Beyonder is the most powerful being in the Marvel Universe followed by Molecule Man.

If Beyonder is the most powerful, why is this in the Molecule Man forum? (Not disagreeing, just asking.)

Buckshot says:

"If Beyonder is the most powerful, why is this in the Molecule Man forum? (Not disagreeing, just asking.)"

Good point. In the old comics I was reading beyonder "left" and became another universe. I forgot that they brought him back as an inuman mutant. So with (in my mind) beyonder gone Molecule Man would be the most powerful.

molecule man vs jesus bring it!

"molecule man vs jesus bring it!"

Yeah Fight Jebus Fight!

JESUS!  Jesus wins easy.

What's the point of being The one above All if you are not in fact the one above all??  I'll stick with DC's the Presence as a better representation of god in comics. 

 Molecule Man is back–and he has supernatural villains all over Marvel Universe at his side.

" JESUS!  Jesus wins easy. "

Sentry beat Molecule Man 
 
Bendis retconed Molecule Man into someone on the level of Magneto