Galatians 4:8, 9

8 But at that previous time, when you had not come to be acquainted with and understand and know the true God, you [Gentiles] were in bondage to gods who by their very nature could not be gods at all [gods that really did not exist].

9 Now, however, that you have come to be acquainted with and understand and know [the true] God, or rather to be understood and known by God, how can you turn back again to the weak and beggarly and worthless elementary things [[d]of all religions before Christ came], whose slaves you once more want to become?