You could be like, “duh, the lyrics use first person pronouns, of course it’s God”, but that really brushes past how cool it is as an artistic decision. 

God only speaks a handful of times in The Prince of Egypt, like, literally off the top of my head maybe 3? 4 times? He speaks as the burning bush and a few isolated times after, and as the choir in The Plagues. But in none of these instances does he speak in his “own” voice.

God, as credited, is voiced by Val Kilmer, the same VA as Moses, and this is who voices him as the burning bush and the other times he talks 1-on-1 with Moses. When God speaks to Moses, he speaks in his voice. Likewise in The Plagues, a song sung as a warning to all of Egypt on behalf of all the Hebrews, God is a full choir of both men and women. Throughout the film God invariably speaks in the voice of the people he is speaking to. 

God’s voice is different to different people. What does this mean? Is it a reflection of how the same God can be worshipped so differently and diversely? Is it a creative interpretation of humans being created in God’s image? Is it a representation of the intense and intimate involvement of God in the Old Testament? Is it something about human perception of divinity - the idea that acts of God are not acts of God until humans interpret them as such, that God is made in our image, not us in his? 

Anyway it slaps.