Judaism acknowledges some of the theories you are proposing, Crazyguy (making you not so "crazy" after all).
One theory is that the Hebrews were introduced to YHWH via the people of Sinai, some of which may have been fellow slaves that escaped with them from Egypt during the Exodus. Jewish scholarship points to clues in the Torah itself as to this being possible.
The critical theory centers on the Exodus narrative, where it is not until Moses flees to Midian, meets up with and marries the daughter of Jethro, "the priest of Midian," that Moses comes into contact with YHWH. ( Exodus 2:16; 3:1-6) Moses then returns to Egypt to gather his people to worship this God on the mount where, under Jethro's patronage, he meets God by Name.--Exodus 3:12.
While most Orthodox Jews who read Scripture with a literal approach similar to the myopic view of JWs would disagree, anthropology and archeology (as well as some of the history of the Jews) suggests that the monotheistic God-concept might have been learned from the peoples that the Israelites joined with during this period. It later grew into the form later adopted (and adapted) by Christians and Muslims.
But Jews also acknowledge that their monotheism does not originate from the Bible. That is a Christian misconception. The Tanakh did not play a central role in the development of Jewish monotheism, but instead it's oral tradition which became the Mishnah, not the Hebrew Scriptures.
The Bible stories are liturgical narratives designed for reading in public worship, not a compendium of Jewish history or religious doctrine (like the Mishnah and Talmud). It was only after the Second Temple rose that the Bible took shape, and its use as the composite library we know today came only after the Temple's demise in 70 CE, far too late to be considered the basis for the theology that shaped its pages. So while there may truly be some merit in what you say, it is also impossible to attribute it to Scripture which came only far much later.