"Hear, O Israel: HaShem is our G-d; HaShem is one!"
Or, as put elsewhere in this week's reading, "know that Hashem He is G-d; there is none else besides Him."
Or, as stated a third time in this week's reading, no less emphatically, "You shall not have the gods of others in My presence."
There is One G-d, and One G-d only. Ancient man often imagined powerful gods dwelling in phenomena all around them.
Is modern man so different?