-SPOILERS- -BELOW-
In Oblivion; you need "the blood of a divine" to open a portal to Camoran's Paradise. You use the Armor of Tiber Septim.
In Knights of the Nine; you need the 'Blessing of Talos' to let the player follow Umaril the Unfeathered into the spirit world. And you can go back to your body afterwards, so you don't die.
At the end of Morrowind; You meet this guy named Wulf, who gives you a power called "Favor of the Emperor." You can later ask someone about this, and they will say that this is a manifestation of Talos; (similar manifestations of Mara and Zenithar happen in another quest.)
Tiber Septim not in Sovngarde, where all the great Nord heros are.
-SPOILERS--ABOVE-
So he is a god, my friends.