Personally, I find it hard to understand why individuals who define themselves as Christians (or other similar mythologies) are on this forum in the first place. Christianity is all about death. Only after you die do you experience "eternal life". Physical immortality, the kind this website is concerned with, from a Christian viewpoint would only serve to keep you apart from god.
For the vast majority of Christians, I would agree. However, the Christians who have, (whether by "fate" or mere coincidence), found their way to this forum, are not like the vast majority of Christians.
I myself am ashamed of the way most fundamentalist Christians view the world and "moral" issues such as stem cell research (though at some level I at least admire their willingness to stick to principles; the ones that aren't being hypocritical, anyway. *cough* Bush *cough*). On the other hand, the majority of people in the U.S. who call themselves Christians don't exercise any serious level of faith, and it is more of a cultural backdrop for them.
For myself, my particular "sect" of Christianity actually meshes well with the goals of this website, and indeed the entire anti-aging/transhumanist movement. I believe that Man's destiny is to become immortal (truly immortal, as in unable to die, not just unaging) in our *physical* bodies, not just in spirit. In the Resurrection, those who have already died will be given perfected, immortal physical bodies. Those still alive after Christ's return will simply have their current bodies perfected at some point during the Millenium.
The earth itself will be reformed into a glorious, perfect world. Each and every one of us (okay, the faithful and repentant sinners; we can argue the merits of that elsewhere) will have the power at our disposal to create new worlds, new life, and even new sentient life (for the remaining souls who have yet to live).
And all of this will happen during the Millenium, the approximately one thousand years after Christ's return (an event I associate closely with the Singularity, though I'm not sure why). Given the exponential (or doubly exponential according to people like Ray Kurzweil) growth of technology, a full millenium should be ample time to literally bring to pass all that Christianity (as I know it) promises.
I have embellished the language a little to tie my religion into the transhumanist movement, but the elements are clearly there. We *know* that we will someday conquer aging, and we *know* that nanotechnology will allow us to prevent a lot of accidental deaths (see the work of Robert Freitas). Much more will be available in the next thousand years, preventing basically all forms of death but the most drastic (being blown up in an antimatter storage container breach comes to mind). The ability to upload our minds at the very last microsecond and be restored to a physical body later may even make these most drastic forms of death mostly avoidable.
As for the earth being "perfected" and made glorious, nanotechnology will give us a good start. Pollution cleanup, whether through nanobots or genetically engineered bacteria, will help. Climate manipulation will provide a further help. I suspect this will only be the beginning of how we "perfect" the earth.
As for the power to create worlds and life? Well, I think everyone here suspects we'll have that technology within the next few millenia. I know I do. Will we have in just one millenium? Well, faith tells me yes.
Finally, what about those who have already died? How will they achieve immortality? Until aging and death are cured, cryonics will allow people who "die" today to be saved tomorrow.
But that still leaves those who died without access to cryonics. What of them? We don't know yet, though we could speculate. We may not ever be able to "travel" to the past (or do anything else that might create a time paradox), but that's not to say that we won't ever be able to "see" the past. If we could "see" the past at atomic/quantum resolution, we could literally "upload" someone's dying mind into the present (our future, of course), and put them in an immortal body. This ability to "see" the past would also mesh well with the popular Christian meme that all are sins will one day be revealed, that our lives will be as an open book.
Getting back to the dead, perhaps "souls" really do exist beyond death (see Peter Hamilton's Night's Dawn
trilogy), and we'll find a way to reclaim them from death.
The only issue that I have trouble resolving is the Second Coming of Christ. I'm not saying that I don't believe, merely that I don't know and cannot speculate on how that would happen. However, that's where "faith" comes in. I associate that event with the Singularity, not because I foresee Christ the Man himself returning, but because of the societal chaos that could ensue given the right political and "coincidental" environmental factors (disasters of "Biblical proportion").
I compare my faith to the faith of Evolutionists from a century ago, who had to have faith that Evolution is true. They didn't have nearly the scientific support and explanations that we have today, but that didn't stop them from pursuing the theory. In their minds, perhaps, they believed they were pursuing science, but given how very poorly they understood how Evolution truly works (not that we know for sure either, but we're certainly much better off today), their perserverance can be easily attributed to faith. However, they turned their faith into knowledge through the scientific method, and today, I suspect that Evolution is far less of a "religion" than it once was, and far more of a "science".
Perhaps the same will happen with Christianity. Perhaps not. At any rate, I don't see a need to die to go to my God, because my sect of Christianity teaches me that in the last days, God will return to us, and there will be a generation, presumably ours, that will not need to die to become perfected. Heaven will literally be made on earth.