A.T. Robertson Commentary Galatians 4:8

"Howbeit at that time, not knowing God, ye were in bondage to them that by nature are no gods:" — Galatians 4:8 (ASV)

To them which by nature are not gods (τοις φυσε μη ουσ θεοις). In 1 Corinthians 10:20 he terms them "demons," the "so-called gods" (1 Corinthians 8:5), worshipping images made by hands (Acts 17:29).