Hang on feetle, don't dismiss your personal contribution so lightly. Your bodily constituents must go back at the very least to the the origins of the universe, so your bits, if you'll pardon the expression, have been roaming round the planets for aeons contributing to that glorious universal Grans-network of which we are all part, and will continue to be for ever. And we haven't even considered yet the genetic consequences of things like quantum mechanics in all its mini-micro-complexity and glory. So, in the meantime, well done all, we're probably going on forever in one form or another. So let that be our legacy!
Now, as regards the accidental nature of creation and evolution. I note that, as far as we know, even the very simplest forms of life and everything else, conform to the known laws of physics and chemistry. This does seem to me to confirm that there is a grand plan or scheme of things (which may, of course, have nothing to do with religion). I just don't know what it is or who is behind it, but I suspect that if we were clever enough to know we would be able to the see the guiding of Gransnet hovering over all!