The ancient Niaya philosophers and the Vaishayaka philosophers believed in God. But they believed God is this omnipotent, omniscient, and the power. A deeper understanding came that if God is truly God, all that there is, then the universe cannot be literally separate from God.
Swami Sarvapriyananda teaches Chapter 10 Verses 4-6 of the Bhagavad Gita. In this series of talks, Swami Sarvapriyananda unfolds the highest truths of Vedanta through the study of the Bhagavad Gita (The Song of God).