Shrimad Devi Bhagwat Puran, published from Gitapress Gorakhpur, edited by Shri Hanuman Prasad Poddar and Chiman Lal Goswami
Vyas Ji is replying to a question asked by Janmajay
Vyas ji says that in Satyug, the Brahmins had complete knowledge of the Vedas. They continually used to worship Bhagwati Jagdambika (Durga). They always used to long for the sight of Bhagwati. They used to spend all their time in recitation and remembrance of Gayatri. The recitation of Mayabeej was their prime duty.
In essence, Vyas ji is implying that in Satyug Brahmins had complete knowedge of the Vedas and accordingly they used to worship Bhagwati Jagdambika.
This proves that even the "Great Saints" of Satyug had no knowledge about the Supreme God as Durga ji herself talks about worshipping some other God.