Bowing the knee is figurative as well as literal. The point si that at the Jdgement seat, EVERYONE will see Christ for who He is. Bowing the knee is an act of submission. It is an act staing the person you are before is in authority over you. At the Judgement seat, there ill be no veil over unbelievers eys or hearts to hide the Lordship and Kingship of Christ. Some, heartbreakingly on the way to everlasting judgement in hell, others to eternity with the One they willingly bowed he knee before on earth. This is one of the truths of our Saviour which should compel us to share of His love and scarifice, that no one before His throne that we know will be in ignorance because of our hard hearts, and stubborn pride.