What does this mean? Society founded on Christian revelation possessing an order that mirrored God's creation?

Revelation refers to the notion of revealed truth - that individuals have the truth individually revealed to them without need for evidence.

"an order that mirrored God's creation" doesn't really mean anything.

I think it means that since the society of Macbeth's time was assumed to be Christian, it was understood to be structured the way God created the world. That is, the microcosm imitates the macrocosm: the local social structure imitates the world-wide structure. God as the ruler of the world, with his obedient people; the king as the ruler of the nation, with his obedient subjects. That sort of thing.

Of course it does not. However, in countries that call themselves Christian, they like to think they are imitating God's way of doing things. Makes them feel holy, you know.