Meanings of pure monotheism in English

Do the traces of a comparatively pure monotheism first show themselves in the recent periods of idolatry?

Naaman was a convert to pure monotheism.

The oldest religion of which we have clear and authentic account is probably the pure monotheism held by the Jews.

But there is nothing in the least liberal or akin to reform in the substitution of pure monotheism for the Trinity.

The superficial view which accounts for the pure monotheism of the Hebrews from their peculiar national character, is sufficiently refuted by their history.