But science can't categorically say that there is - or isn't - a purpose. It can't answer the question.
Nor can God really. Belief in God, for most people, is based upon faith, so any question that God 'answers' is an answer from a faith position - in other words not a logically derived answer from a progressive argument but something taken on trust, almost like a parent giving the answer 'because I say so', which is no answer at all. And even then, all that the existence of God does is to take that question of purpose up a level, because if the answer to the question 'What is the purpose of life?' is 'to serve God', then the next obvious question is 'What is the purpose of God?'.
I don't see the unfathomable ideas of purpose and worth to be questions really - not questions that need to be answered anyway. Purpose and worth are rather things to be sought in themselves. We know when we have purpose and worth, not because we can pin an argument down and explain it, but because we can feel it. When we feel such things, we haven't answered the question of whether there is any
ultimate purpose, but what we can feel and know within ourselves and our relationships, even if it is only the illusion of purpose or worth, does the trick, gives us what we need.
I'm not talking about fooling ourselves, about deliberately believing in an inconsistent idea in order to get the goodies - which is what so much of religion is about. I'm talking about being as honest and open as we can with ourselves about what makes us
feel purposeful, of worth, truthfully fulfilled etc. recognising that there are perhaps no ultimate empirical answers within our grasp, but pursuing what we
feel. For me, and I expect the same is true for many others who try to do this, when I boil it all down I come to the one thing that I 'know' to be of worth and that is Love, in its broadest sense, in us and between us.