Body, Spirit, Death and Eternal Judgement
I identify as a conservative old earth Christian… not that I am that old, but I am somewhat older 
I am a newbie to the site, so please take that into consideration. Sorry, this got long because my passion runs deep. This is a general post on the subjects being discussed.
One thing I value about listening to non-Christians speak about Christianity and Jesus is the unfettered critiques and perspectives. I have been inside Christianity since the cradle, and many themes are so drummed into my head so completely that the absurdity of certain beliefs may never come to mind without fresh perspectives. Science has inherent crosschecking built into the process to identify error and work to find better accuracy. I know Ohm’s law works. I witnessed it daily for 36+ years. Theology is nothing like that unfortunately, and because of this reality, we Christians should be mindful that errors in our thinking/teaching do exist, maybe even shocking ones. I trust the Bible itself, because if we are to held responsible for our actions, G-d must communicate something to us, and I recognize the Bible as the clearest example of respectable G-d-like virtue (and I appreciate how debatable that may be depending on the reader). However, it is the Christians who study the Bible and teach others its meaning who need to be crosschecked, and that pretty much includes all of us. Our methods and assumptions for Biblical interpretation find their roots in antiquity. Could a concept such as social evolution make any difference in how we think about G-d’s methods of communication with humankind? You bet it could and does. I think we need a reboot of our methods for Biblical interpretation which in turn would yield an updated old earth systematic theology. (This is why I think Christians need to embrace/teach old earth and officially kick 6-day to the curb.)
I have a son who is a near-atheist and I love and respect him as a sovereign person in charge of his own thoughts and responsibilities. From my perspective, I think science loving atheists are the most justified in their beliefs, because science provides an explanation of reality which to date shows no sign of a creator evident in the equations. I see rationality in the holding of this perspective, especially for people of science. And I also see it as a mindset requiring faith, even great faith.
I know what I am about to say isn’t popular among us Christians, but this perspective has become my belief based on my personal wrestling match with Scripture. Roman’s 2 speaks of a faith based not in Jesus, but a faith based in a perception of a creator and thereby a faith mainly in goodness for goodness’ sake. We call this natural revelation and I have come to see it as the fairness of G-d which has been available since the beginning of humankind. When any sapient person sees others harming one another or people helping one another, these occurrences witness to their being. They then make their own decision about how they will conduct their own life, and they live that life. I would wager this forum is filled with people, perhaps all who strive to do good because we all believe in good. We believe it is the right thing to do for good reasons. Romans 2 says that this is a saving faith. Judaism has always taught of the righteous man, a non-Jew who lives righteously. For these reasons, I count as brothers and sisters all those who aspire to goodness, because although they may not believe in the G-d of Abraham or Jesus, they believe along with G-d that goodness is rightness. In the end, this is truth. In my view, the Bible teaches that the Bride of Christ is made up of those who know and love Jesus; but the bride and groom are not the only participants in the wedding. Many more are there, and I expect heaven to include all those who have placed their faith in goodness just as Romans says. Their hearts and behaviors betray the nobility of their intentions and they are vindicated before G-d.
Wow, no body thinks I am conservative now… But I think that is what Romans is saying, am I wrong? 
We all remember the story of Jonah, the big fish story, but the real story there is the love of G-d for the 120,000 people of Nineveh. Please notice, they were not Jews and they didn’t convert to Judaism, yet they are counted as saved in an eternal sense. Just sayin.
Death and Eternal Judgement
I think we all plan to die someday. I know I do. You can view death as a curse or a judgement or simply as a reality of our existence. But it does include an element of finality. I don’t think most of us view it as unfair, but some could. It is hard for those who remain here even under the best circumstances such as after a long, loving and productive life.
Spiritual life and death is much more ethereal. But for similar reasons to physical death, I am not offended by the possibility of a spiritual death as long as it is humane. I currently do not have the proof I seek to convince myself of the exact error in theology, but in my retirement years I am seeking such proof from Scripture. Natural revelation has taught us all in western culture that torture is wrong. No matter what someone has done, torture is not warranted as recompense for the crime, and that is not about to change. Surely G-d is the author of that mindset, just as good seeking is a rational choice of a good heart. A plain reading of John 3:16 seems to some up my thinking. The word perish is used throughout the Bible to signify bringing an end to things, an end, not an endless end. A spiritual death is eternal, by definition.
I do not believe that G-d desires an eternal never ending torture to define death. Let me ask you, if you are a friend of G-d or of good, would you ever wish to exist in perpetuity knowing that every person you ever knew who didn’t love good is actively living in endless agony for endless billions of years while you are living in endless perfection and/or goodness? And if you were running the universe, would you punish anyone in such a way?
The punishment simply does not fit the crime. No one choses to be born. It is not a sin to not like or love G-d. You can love good and not even know G-d. Yes, because of original sin, we stand condemned (meaning we will die), but doesn’t the Bible also teach that children are protected, and if when they reach accountability they choose good over evil, then in practice they are never actually condemned in an eternal sense. So, in practice, did they ever stand condemned?
If in the end, spiritual death is the necessary death of an ill-intentioned life, then so be it. But it needs to be an ending of life, not an endless torture. If we are to be G-d’s best friend, surely what we think matters a great deal to G-d. Do you ignore the concerns of your spouse? Just askin. 
Sorry for the length, Jack