Ye know that ye were Gentiles, carried away unto these dumb idols, even as ye were led.
That ye were. (Ephesians 2:11) So B G f. But 'Aleph (') A C Delta g, Vulgate, read 'that WHEN ye were:' thus "ye were" must be supplied. "Ye were" blindly "carried away" at the will of your false guides.
These dumb idols - Greek, 'the idols which are dumb,' contrasted with the living God, who 'speaks' in the believer by His Spirit (1 Corinthians 12:3, etc.): and who then gave "tongues." Their past pagan ignorance of spiritual powers is why they needed instruction as to spiritual gifts, especially as to the tongues. When blind, ye went to the dumb.
As ye were led. The Greek is, rather, 'as ye might (happen to) х an (G302)] be led.' You had no criterion of truth. The pagan oracles led their votaries at random.