Why is it dangerous to deny the doctrine of Christ?

Denying the doctrine of Christ is perilous because it equates to rejecting the very foundation of Christian faith. According to 2 John, those who do not confess that Christ came in the flesh are antichrists and do not possess God. This rejection can mislead congregations into believing they can attain righteousness by their works instead of through faith alone in Christ. Such deception leads to spiritual death and eternal separation from God, making fidelity to the doctrine of Christ essential for both individual believers and the corporate church.