Will believers rule and reign with Christ in the coming kingdom?
Yes. Believers will be present when that kingdom is established on earth and will rule and reign with Christ over it. At salvation they are translated into His kingdom now, and they will share in its future earthly administration as members of that kingdom.
Les teaches that although Israel rejected the King and the kingdom and crucified Him, nothing regarding His kingship and the kingdom has changed. He is still the King of kings and Lord of lords, and the kingdom remains centered in Christ. At salvation, God translates believers from spiritual darkness into the kingdom of His dear Son, which is now in heaven. But that same kingdom will one day come and be established on earth, and believers will be there with it, ruling and reigning with Christ over that kingdom of which they are now members by virtue of their salvation experience.