Did Hebrews only believe in one God who is all powerful?

Yes, the ancient Hebrews believed in one God, a concept known as monotheism, which is central to Judaism. They viewed this God as all-powerful, transcendent, and the creator of the universe. This belief is foundational in their scriptures, particularly in the Hebrew Bible, where God's sovereignty and unique status are emphasized. Over time, this understanding of God influenced the development of other monotheistic religions, including Christianity and Islam.