We are free from the law of death that hangs over man because of being raised up in life "with Christ." No other Resurrection qualifies. Revelation chapter twenty, verse six tells us that these that hath part in the 1st Resurrection are Blessed (true Believers) Holy (true Believers), and on such the second death hath no power (true Believers). It can only be this way because they have part in the First Resurrection with Christ. They've already been raised up so that if they live and believe they shall never die, and if they die, yet shall they live. They are Priests of God (true Believers - Revelation 1:6) and Live and reign with Him for the fullness of time, symbolized by 1000 years. All pointing to our resurrection in Christ, not a future event.
Another clear indication that this thousand years cannot be understood literally is that it says these live and reign with Christ 1000 years. The fact is, these Martyrs, whoever people may claim they are, are true believers, and as Such will live and reign with Christ Forever not literally only 1000 years! And so again it doesn't make any sense in a literal 1000 years. Are these souls living and reigning with Christ 1000 years, and then Christ declares, time to loose Satan, and they can't live and reign with Him anymore because your "literal" 1000 years to reign is now up? The answer of course is, "that's silly!" But if This 1000 years is literal, that is exactly how you would have to understand it. These souls literally lived and reigned with Christ 1000 years. Not 2000, not 5000, not forever, but 1000 years. Literal just does not add up. It won't stand the test of accuracy, it won't stand the test of context, it won't stand the test of content, it won't stand the test of faithfulness, and most important, it won't stand the test of Biblical consistency. It is blatantly contradictory with other scripture if we understand it as literal. It is no more a literal number than when God says He owns the sheep on 1000 hills means they are the only ones who are His. He owns them all. And this 1000 years is symbolic of that fulness. It's the time of the fulfilling of God's purpose for the Church.
The 1000s years can apply to an extended time measured in thousands. The element of reigning with Christ over the nations may only be necessary for that period of time but forgive me if I have forgotten where their reign was stated as everlasting. What I recall is that the kingdoms are given to the followers of Christ
Daniel 7:27 (ESV)
27And the kingdom and the dominion and the greatness of the kingdoms under the whole heaven shall be given to the people of the saints of the Most High; his kingdom shall be an everlasting kingdom, and all dominions shall serve and obey him.’
This verse however is not explaining the reign with Christ but mainly the inheritance of the kingdom. What is not easy to tell is the possible continuing service and obedience of these dominions comes into play within the continuing kingdom. Who are these people? How are they differentiated from saints?