Moses & Thrall
: Both are orphaned as a babe and raised by the "enemy," the people who enslaves his race of origin. Moses and Thrall are both given an education that mark them as learned men. (This is less so in the Hebrew Bible, but in the later traditions, such as in Acts 7 or Josephus.) The primary difference is that Moses was, ironically, continued to be nursed by his biological mother, and his parents remained alive. And Moses, as a Hebrew child, was also the target of the killing by the oppressive power, whereas Thrall's parents were the target of the killing by the corrupt power in his own people.
Rediscovery of Identity
: Then at a certain point in their lives, both end up escaping the home of their upbringing and fleeing into the wilderness. This marks a period of rediscovery in which Moses and Thrall learn what it means to be Hebrew and Orc, respectively. Moses learns from his kinsmen, the Midianites, while Thrall learns from the Frostwolves and Warsong Clan. But the process also involves a rediscovery of a "lost" spiritual tradition, with Moses learning of the god of his ancestors, and Thrall learning of the shamanism of his ancestors. Moses experiences the Burning Bush theophany thereby becoming a prophet, while Thrall has a spiritual quest thereby becoming a shaman. Both will become "the greatest spiritual leaders" known by their civilizations.
: Both figures return to the home of their upbringing in order to liberate their enslaved people. The liberation provides "spiritual proof" in the form of "signs and wonders" that validates their respective spiritual traditions. This involves a confrontation with the people of their past, though the Pharaoh is unnamed. One of the key differences here is that Orgrim Doomhammer's death serves a similar function as the death of Moses, who is unable to enter the Promised Land. And Orgrim's passing of the authority of the Horde to Thrall is similar to Moses's passing of the authority of the Hebrews to Joshua.
: Medivh serves the role of Yahweh, in that both figures promise a land of salvation for the Orcs and Hebrews, respectively. Moses leads his people across the Red/Reed Sea, which symbolizes the effective "birth" of Israel. Thrall leads his people across the Great Sea, which symbolizes the effective "birth" of Durotar. Thrall rekindles the previous spiritual tradition of his people and provides laws and spiritual program that form the basis for their future civilization. Also with both, their older brothers (i.e. Aaron and Grom, figuratively) die prior to the settlement of the land. And both the Hebrews and Orcs are referred to as being something of a "stiff-necked" and stubborn people who tend to fall back on old sinful habits and wicked ways.
The Conquest of the Promised Land
Thrall and Moses arrive to the "Promised Land," which amounts to an arid desert that is hardly overflowing with anything. Thrall and Joshua then conquer the Promise Land and its native people.