Though I'm religious, I'm very against the church as an anarchist (but I digress); though the idea that science and medicine can push forward much quicker with immortality I know it will just further divide the social classes and make the demagogues into demigods.
There's no chance that immortality would be distributed fairly amongst everyone, those that can pay its price will take it and the rest will be left to rot. Old money will become immortal money and further consecrate it's power while using the rest as fodder.
I know it will do good, but I can't imagine that good outweighing the bad.
Nepenthe