Do you not know the saints are judging the world NOW! Every time a saint faithfully proclaims the gospel of the Kingdom of God whoever hears is being judged through the Word. Because there is spiritual power in the Word of God, for those who hear and believes are judged worthy of eternal life, and those who hear and continue in unbelief are judged worthy of damnation/death.
Saints also judge HUMAN MESSENGERS of God by what is taught. Are they teaching truth or lies/errors? If truth, the saints who are the messengers of God will judge elders and shepherds worthy, if lies/errors the elders and shepherds will be judged unfaithful liars and deceivers.
Paul shows why it's important to raise up wise, noble, honorable, faithful God-fearing men to shepherd/overseer the flock of God. Because the saints are to be judges over any disputes we have among us, rather than taking these things before the ungodly of the world. It would be better for us to take our differences to those who are the least esteemed, i.e. have a Christ-like heart for serving, rather than look to the world of unbelief. Because Christ, before departing this world gave good gifts to His saints, "apostles; and some, prophets; and some, evangelists; and some, pastors and teachers; For the perfecting of the saints, for the work of the ministry, for the edifying of the body of Christ:" Saints should certainly be able to judge between themselves rather than seeking advice and judgement from the unbelieving world.
1 Corinthians 6:1-5 (KJV) Dare any of you, having a matter against another, go to law before the unjust, and not before the saints? Do ye not know that the saints shall judge the world? and if the world shall be judged by you, are ye unworthy to judge the smallest matters? Know ye not that we shall judge angels? how much more things that pertain to this life? If then ye have judgments of things pertaining to this life, set them to judge who are least esteemed in the church. I speak to your shame. Is it so, that there is not a wise man among you? no, not one that shall be able to judge between his brethren?
Surely you do not believe that saints will be judges over angels of God that are spirits sent to minister to the heirs of salvation! What would we judge them for? Do you believe saints are going to judge Satan because you believe he and his demonic hosts are fallen angels of God? Will we become the judges, or does the Bible show us that God Himself is the JUDGE of the whole world through His Word and Spirit?