I personally don't care much about the uncertainty. It would be pretty cool if we just dissolved into our spirit form upon death; visible to each other and all but living humans, and carried on existing. But I have no fear of the Abrahamic version of things, I am more disappointed in the Abrahamic god than anything. If there is anything I would hate above all else, it would be to die a Muslim.
Actually, this is one of the things that has always puzzled me about the God religions. Existing in Heaven forever? What's the point. Just keep existing and existing...
Would the joy of Heaven be so great that you'd be happy to lay back and do nothing very much for forever and ever?
God creates the Earth as a (very) short testing ground, then you're either confined to Heaven or Hell for eternity, just so you can exist forever and ever...
And what about my loved ones? They did the wrong thing and so now we're separated from each other forever? How does the bliss of Heaven overcome the sadness of being separated from the people I care about forever?