You have no idea how adoms work. I'll try to answer your questions (Yes science!)
So everything is made of atoms, right?
Correct.
And that basically means that cells are also made of atoms too.
Of course.
But cells have specific parts like the nucleus and DNA, but if all of them are made of atoms, how can one part digest, but another part cant?
Each Cell part is made of lots of atoms. They have different elements and whatnot.
Also, how can atoms store information, like memorizing and whatnot.
I honestly have no idea. I have a feeling it has to do with the arrangement of atoms. DNA stores information this way.
Also, how can cells be differenciated if they are all made out of atoms?
As said before, hundreds, if not thousands, (if not millions, I'm not sure) of atoms in each cell.
The human body has 70 trillion atoms.
.... I see your point. I know that parts are made of different atoms, but DNA can control the formation of the human body, but all of it is made of atoms.... Get my point?
AND WIKIPEDIA CAN BE PUBLICLY CHANGED, so lets say i wanted to change a topic, i just go and change it, so it cannot always be correct.