Monotheism in all ancient cultures.
The monotheistic Hebrews were intermingled with middle eastern populations after fleeing northern India's massive earthquakes and the Arya/n invasion and plundering that brought polytheism, now Hinduism, to India. Ancient cultures were monotheistic, with Egypt's Ptah, and China's Shang Ti being typical exemplars. Overthrowing landmarks, i.e., taking land, was common in the cannibal polytheists of the "patriarchal revolution" of men centering in gang-like lodges and longhouses and turning sacred women into temple prostitutes and killing their children.
Overthrowing landmarks was a violation of sacred land rights that flowed through the female in monotheism, and the little figurines later worshiped as goddesses were pictorial land titles. Those lands that were granted to the Hebrews by God were taken from their kinsmen who also fled northern India but had succumbed to the Arya polytheistic paganism. King Sargon fought against rebel priests from Ur of the Chaldees, including one that tried to rape his daughter to claim kingship. Later, Abraham was told to flee that area with his wife, the sacred mother who defined kingship.
Akhenaton was not an inventor of monotheism but a reviver of monotheism. Egyptian religion flowed back and forth between a kind of monotheistic orthodoxy and the later innovations. Worldwide, after the Flood of Noah, there came ancestor worship as people deified these four couples who were the last of those who had extremely long life spans. In Egypt they are the Ogdoad, and China remembers them in the Eight Immortals. These are the human-like "gods" of scrambled Greek myth, deified because they lived so long. Imagine grandparents, great-grandparents, and great-great-grandparents are long dead but the great-great-great grandparents are still alive. Makes an impression of divine immortality, no doubt. Akhenaton returned Egypt to monotheism and was extremely generous in granting a major economic concession to the Hebrews, probably in honoring their monotheistic beliefs.
The monotheists were persecuted in Egypt and had to go underground. Noah's son, Shem, was probably the "shepherd king" who created the Great Pyramid as a tomb for Adam's bones as recorded in hieroglyphs stating the sacred bones of Ra/Adam were on the sacred boat of Nu/Noah. And the Great Pyramid acted as a memorial to the Great Flood. The Great Pyramid's passages and granite butterfly doors are valves for a hydraulic ram pump that was to fill a great lagoon with a replica of Noah's Ark. A copper float valve likely regulated the creation of hydrogen gas from acid-treated water as an implosion is evident--the eternal flame went out with a bang after the monotheist creators were driven out. Hebrew tradition says that Shem took the bones of Adam to Golgotha's cave; then translated the bones to the cave at Machpelah which Abraham bought to bury Sarah.
There were ancient prophecies about the coming Savior, and this is nicely elucidated in D. James Kennedy's "Gospel in the Stars" tying the Virgo Mary to Leo the Lion of the Tribe of Judah. These prophecies were recorded as being consulted in China when the emperor questioned the sages about a new star appearing in the heavens. The Isis/Horus/Osiris mother-child import is not novel and represented another claimant to the throne, one allegedly slain by Shem, who was demonized in Egyptian symbols after giving the "immortal" the god test, one that was flunked. After slaying the claimant, he stayed dead, and orthodox monotheist Shem cut up his body and sent it throughout the land to show their "god" was not immortal.
That Jesus Christ fulfilled the hundreds of prophecies foretelling Messiah's coming, even the one giving the exact day of His formal entrance into Jerusalem, is not disputed. God says that He veiled the hearts of those Jews who rejected Jesus Christ, this until the time of the Gentiles is fulfilled. Embracing Christ's divinity is a gift from God. Embracing the law of unbridled love of God, and love of neighbor as self, takes only common sense and if that's the modern legacy of monotheism, it is well employed in being the basis for granting Americans inalienable rights to life, liberty, and the pursuit of happiness.