It was recognized by Rashi in his 11th century commentary to Deuteronomy 6:4 that the declaration of the Shema accepts belief in one god as being only a part of Jewish faith

at the time of Moses but would eventually be accepted by all humanity.

When did Judaism first appear?

Although Judaism as a religion first appears in Greek records during the Hellenistic period (323–31 BCE) and the earliest mention of Israel is inscribed on the Merneptah Stele dated 1213–1203 BCE, religious literature tells the story of Israelites going back at least as far as c. 1500 BCE.

When did monotheism appear?

Origins. Quasi-monotheistic claims of the existence of a universal deity date to the Late Bronze Age, with Akhenaten's Great Hymn to the Aten from the 14th century BC.