I don't know that immortality is possible per se, but I think living much longer is. I think concerns of overpopulation are misplaced and based on fear mongering. Malthus thought the Earth was overpopulated 150 years ago. It's not overpopulated as it is, not really. Technology and better use of resources can increase the number of people that can survive on the Earth and beyond etc. I don't think living longer would necessarily be "against God" exactly. Would life become ultimately boring for people that lived too long though? Would we lose something if we felt we could never die? I don't know.

Gattaca is a great movie, but really ignores the economics of it. Yes, at first only the wealthy will have access to genetic engineering, but they will also be test subjects of sorts. Over time more and more people would have access to it as the technology evolves and becomes cheaper.

Whats the point of starting if you cant stop.

I'm not sure if it'd be available to more people easily, what resources would it use? what would the process be for genetic engineering?

I think retroviruses would play a role in some way. Beyond that I don't know.

Biological Immortality for only those who are venturing in 

ban it for everyone else, i.e immortality requires exile from earth.

Love Gattaca. There's a not so great movie dealing with this in a rather cynical way, In Time. Everyone stops aging at 25 but you have to earn time to live longer, if you run out you die instantly. Basically the rich and powerful end up hording all the time.

Biological immortality would be great, if that includes the mind. So many places to go, so many things to see. When my kids are grown up, I'll be past 55 already, life is short. And if you get bored of one place, you can always move somewhere else. It's not like you have to plan for your retirement anymore.

You can still die... What we would lose is lying attached to a respirator in a hospital with your family having to decide when to withdraw care.

I'd take it, mainly because I want to be there when humanity reaches FTL speeds and traverse the Universe. Once that happened I'd be content and be willing to die.

Edit: unless humanity gets wiped out somehow before we reach that moment.

Yes. It showed a really dark and cynical aspect of genetic engineering, and was quite intereting overall.