Acharya Prashant explains that when individuals proclaim the oneness of God, they often inadvertently prioritize their own ego. By using phrases like 'Me and my father are one' or 'There is but one God,' the 'I' remains the stubborn, unaltered center of the statement. While one may profess to worship God, they are often secretly worshiping the petty ego, making them polytheists in practice. The ego is treated as indispensable, while God is treated as a tool to placate one's own designs. True devotion is absent when the ego remains the primary master, as the ego thrives on social respectability and the opinions of others.