Paul had a real concern that the Corinthian believers would be pulled away from the simplicity which is in Christ and be tricked by a false, qseudo gospel. He compares it with the story which started it all in the beginning. Eve was tricked by the serpent and that is where all sin began. If the church allows herself to be entangled either by the corruption of worldly bondage again, or accepts the new age religion rather than pure old-fashioned salvation, the same thing could happen that caused things to be in a mess as it was after the fall of humanity, and will result in things being the same way spiritually. Staying true to a simple gospel that works will avoid all of this.