The All Egyptian Theory
http://www.atlantisquest.com/Manetho.html 
From an Egyptian perspective:
Ptah is Hephaistos
Ra is Helius
Shu is Altas
Geb is Cronus
Osiris is Dionysus or Heracles
Seth is Typhon or Poseidon...
Horus Over the Horizon - Zeus
Thoth - Mnemosyne
Neith is Athena
http://www.geocities.com/Athens/Forum/2 ... ion-4a.htm 
Onuris(SHU) is clearly an Egyptian Atlas but was identified with Ares, the Greek war-god, because, like Inanna(k), he had acquired warlike characteristics which, most likely, originally belonged to Draco (as mentioned above).
Horus Over the Horizon? 
He's probably the other choice of Helius or Zeus... let's call him Zeus, because Zeus comes after Cronus.
http://library.thinkquest.org/03oct/01739/demeter.htm 
Thoth: god of learning, memory and wisdom Greece 
Thoth - Mnemosyne
Pillars of Osiris (in Busiris?) become Pillars of Heracles. Other Pillars in Egypt are the Moses pillars on the Red Sea.
Go with the Red Sea - as the Atlantic Sea, beyond which lies the True Ocean. (Herodotus says "The Red Sea" and the "Atlantic Sea" are equivalent.)
In this scenario... all of the gods mentioned in Timaeus / Critias refer to the Egyptian Gods.