The Essence of G-d was kept hidden
It seems from Rambam (according to Rabbi Triebitz’s reading) that the concept of G-d and the theology which is alluded to in the tetragramaton does not appear in Chumash at all. Apparently the concept of negative theology and (according to Rambam) true monotheism was entirely word of mouth until the time of the second Beis Hamikdash.
A very interesting, if somewhat radical and scary, shiur.
Section I Chapter 64,
Section I Chapter 65,
Negative Theology 16;
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Click here to download the shiur in audio mp3 format
Negative Theology 16