Before Mount Sinai, there was earth and there was heaven. If you wanted one, you were obliged to abandon the other.
At Sinai, the boundaries of heaven and earth were breached and Man was
empowered to fuse the two: To raise the earthly into the realm of the spirit, and to bring heaven down to earth.
Before Mount Sinai, the coarse material of which the world is made could not be elevated. It could be used as a medium, an aid in achieving enlightenment, but it itself could not be enlightened. The spirit was raised, but the earth remained dark.
At Sinai we were empowered to take physical objects and transform them into spiritual artifacts.
Our forefathers task was to enlighten the souls of men. Ours is to transform the darkness of a material world into light.
Isn't the relationship that Abraham had with G-d just as elevated as the experience on Sinai?