I'd first like to say that I didn't have a religious upbringing, nor have I educated myself on the subject of religion (something I'd like to change eventually). That said, Hinduism (or my own perception of it, at least) has always had the most appeal to me; mostly the ideas of Karma and reincarnation. Were these concepts to be actual, 100% real and existing laws of the universe, I believe the quality of life for us all would be dramatically superior to what it is now. Those who mistreated one another and the things around them would be reborn as something inferior (human being reborn as an animal, for instance), and those who were benevolent would be reborn superior, a cycle referred to as saṃsāra. This cycle continues until one is able to recognize his/her own soul as a part of Brahman (the eternal soul), he/she achieves moksha (liberation from saṃsāra), and is able to exist within the realm of Brahman, in supreme immortality.
These all sound like good things to me, and would also help ease my fear of eternity.
(Again, I can't stress the fact that I'm pretty much entirely uneducated enough, so pardon any inaccuracies.)