One has to take into consideration what Christians took for granted. All power and authority was given Christ by God. Christ is never equal to God.
Paul describing the end events says of Christ: "Then the end will come, when he hands over the kingdom to God the Father after he has destroyed all dominion, authority and power. For he must reign until he 'has put all his enemies under his feet.' The last enemy to be destroyed is death. For he 'has put everything under his feet.' Now when it says 'everything' has been put under him, it is clear this does not include God himself who put everything under Christ. When he has done this, then the Son himself will be made subject to him who put everyting under him, so that God may be all in all." (1 Co. 15:24-28)