Regarding the 1000 year reign of Christ (which is what I believe is described in the passages you cited) and the place of the believer in it.
I distinguish between New Testament Christian and believers of the Old Testament era and those who become believers during the seven year Tribulation and survive it to enter into the 1000 year kingdom. We, who are saved during this age of Grace, are inheritors with Jesus. During the 1000 year reign we will have celestial bodies. We will have received our promises in Jesus. I understand that those who survive the seven year Great Tribulation, and are believers, whether Jew or Gentile, will enter into the Millennial Kingdom in terrestrial bodies. They will marry, bear children and be governed by Christ, the church age believers, ruling alongside Him. Those who will participate in Temple worship will be those Jews (including, BTW the so called lost tribes who have never been lost to God). I am not sure I think Gentiles will also participate in those Temple ceremonies during the Kingdom. I imagine some will. But I am certain that those ceremonies would not apply to those who were saved in this age any more than they would apply to Christ Himself.