NET

3 But I am afraid that just as the serpent deceived Eve by his treachery, your minds may be led astray from a sincere and pure devotion to Christ.

Darby

3 But I fear lest by any means, as the serpent deceived Eve by his craft, [so] your thoughts should be corrupted from simplicity^D8492 as to the Christ.

Darby Bible Notes

simplicity - 'Simplicity' here refers, not to a personal trait, but to the doctrine as to Christ; what a faithful heart retained in simplicity, as taught in the truth. To say 'which [is] in the Christ,' is too much as if it were in Christ himself, not the doctrine.

KJV

3 But I fear, lest by any means, as the serpent beguiled Eve through his subtilty, so your minds should be corrupted from the simplicity that is in Christ.