Even science says that matter can neither be created nor destroyed, so even if all that happens is I turn into mulch, I'm still around as mulch molecules, which at a very basic materialist level means eternal life. As mulch yes, but maybe I get sucked into a plant, then a bird, then an animal that eats birds...And so forth.
But that's not what I believe.
What I believe is that the energy that makes me 'me' is part of a force that does no harm, a loving, intelligent light that is eternal and expanding. You can call this any number of things, God being one of them, but there are many others.
So I believe we are all a part of that light and we shed our bodies at death and are absorbed back into it. I like Sid Kemp's answer a lot. Me, I would make the worst monk EVER, so my answer to the Buddha would be the compassion and meditation thing if reincarnation (or eternal life) was real, but if it was just this life only, I'd probably eat more, take more risks, travel more, but still be kind. I don't know if service would be as big of an honor if I thought I was just a pile of meat destined to be gone shortly. Maybe it would but if I'm honest I think, wow, I'm not that good a person...
On the other hand, if I know there's no escape and we are here forever in some sense (and this can be batted around until you fall over) and that we are all a part of this Divine Light, then it looks different. It looks like I'd better care about making life better for all sentient beings, not just me. Because the greatest pain that can be experienced is to be in the presence of this light and know I did not try my best to share it out, the comfort others.