LOL, you don't have a clue, do you.
Molecule Man, the master of the molecules said that he never experienced something like Sentry's molecules and lost in the end. What makes you think that Thanos can achieve more with his matter manipulation? Because he made Champion go away? Leave it be.
Like every time he returned back from the dead? O_o
Sentry is immortal, face it. The only way he is gone now, is because Robert decided not to return to save the world from the ever returning Void.
Why did you create this thread in the first place? Do you think you're awesome?
There is more then enough content for you to deal with in the "Sentry vs Lord Marvell" thread.
Coming into a thread and saying: "Thanos wins" won't bring you far. It is not going to end for you well, do you understand that?
Sentry won't defeat AOD Thanos, yet AOD Thanos won't defeat the Sentry. It's a stalemate, because they both can't die.
Let Thanos face a regular Sentry, whose immortality is a part of his very own powerset and what then? He would lose it. Not mainly because of Sentry's immortality, but because of the many more advantages.
Is Thanos going to molecule manipulate the crap out of the Sentry? Hell no, since Sentry is superior in that area.
Is Thanos going to energy blast Sentry into oblivion? Hell no, since Sentry can operate on a higher rate.
Is Thanos going to come up with some fancy abilities to get rid of the Sentry? Probably even here a hell no, since Sentry already redirected energy without even knowing what it was. He is that awesome.
Is Thanos going to speedblitz Sentry into oblivion? LOL!
Is Thanos going to overpower Sentry physically? Even if Thanos is stronger (yet he actually lacks the lifting feats to prove his strenght level), he will be way too slow to actually tag the Sentry.
Is Thanos going to outlast Sentry with the force fields? Something Doctor Doom was not able to, something Reed Richards was not able to? I don't think so. Hell no!
Is Thanos going to BFR the Sentry? Hell No, since Sentry can fly at speeds beyond the speed of light and he can even teleport.
Is Thanos going to mind-rape the Sentry? Hell No, since Sentry was basically never defeated by the usage of telepathy. Emma Frost and Xavier were not able to attack him mentally to protect the X-Men. They had to combine their efforts to even enter the White Room Emma once built in Sentry's mind with Sentry's permission. That's about it.
There is basically nothing Thanos can do. Thanos probably has the durability in the end on his side and there is no doubt that he has the intellect and the prep-advantage, yet in a random encounter his main advantages are away. His shields wouldn't hold off the Sentry and his durability would have to take all the damage Sentry can inflict and that is a lot.
But even the prep-advantage? What is he going to do? Doctor Doom doesn't know how to defeat the Sentry, Tony Stark doesn't know how to defeat the Sentry, Reed Richards doesn't know how to defeat the Sentry, S.H.I.E.L.D. doesn't know how to defeat the Sentry.
Thanos coming up with a way would be a new plot-device, yaaay, basically something what restrained the Sentry so often in the past, like for example where Hammond overloaded him with a little bit fire, LoL and BFR'ed the Sentry.
Stupid writing at it's finest, if we think about Sentry's power set and how he was standing in front of the sun and in the sun multiple times.
Thanos intellect would give him some room to breath, but only if Thanos decides to set one foot in front of the other, until he is gone.
I don't think that's the same thing.
Immortal is not instantly immortal. Immortals can live on without dying, but if someone manages to kill them, then it's over for them. Being actually able to return from the dead. Basically appearing out of nothing. That's the real deal and Sentry has that.
Never explained directly in the comics, but yet understandable:
Sentry returns back from nothing. Not nothing, but something like solar wind.
Explained in the comics:
The super-soldier-serum phased his molecules one step ahead of the current timestream, the reason while Molecule Man never experienced something like Sentry's molecules. They are simply from a different point of existence. When he gets destroyed, his mental powers manifest his physical form.
That means that he basically manipulates the solar wind > photons > atoms > molecules to recreate himself somewhere.
Much of his power set is based on light. Basically everything is based on light, that's why he was always thinking that his powers come from the sun. The sun radiation empowers him, since he is able to absorb various kinds of radiation and become stronger in the process.
He can manipulate the solar light / radiation to turn invisible. He can manipulate the light to affect the photons and therefore control the atoms, which are parts of molecules. With that he can turn intangible. With that he can teleport, with that he has an insane amount of durability and invulnerability, with that he can even heal and resurrect. It's all about molecule manipulation and Thanos isn't going to kill him off.
And it's not molecule manipulation, it's Thanos killing beings that can't die. For a comparable example, the Elders could reform from getting broken down into a feedable substance for Galactus. Yet, Death was able to kill them. Wolverine could heal from absolutely nothing which I attribute due to immortality. Deadpool can survive anything, not mainly because they have healing factors, but because they're immortal. You can't kill an immortal being, much like Sentry, and if you can, then they're not immortal to begin with. There is no "killing them and it's over", it's kill them, and they come back.
Nothing in the Cancerverse could die, no matter what happened. They got "killed", and came back instantly. Thanos blasted them, and they couldn't return. Thanos has the power to kill beings thatt cannot die. Don't know how much more obvious it can get.