What you really mean is that it doesn't exist because it has never been found. I would assert that some have found it. You may argue that without objective evidence they have nothing, but I would say that you won't allow yourself to believe anything without objective evidence.
You are doing that thing again where you break things into a binary choice. Those who follow an impossible robot-like existence determined solely by reason, rationality and objective evidence Vs those who accept irrational beliefs.
Finding purpose and meaning in life can be very personal and subjective in many ways. Love, children, family, friends, companionship, fulfilment, goals, experience etc. are amongst the things pretty much everyone would cite.
But finding meaning in loving and bringing up your kids (for example) is clearly more grounded than finding purpose by divining the wishes of a supernatural being and seeking to live your life according to how you believe this entity wants you to behave.
I don’t love my kids and find meaning and purpose in bringing them up because my scientific instruments tell me to. But equally I’d agree with Tangle that there is no reason to think that some sort of elusive God given higher purpose even exists.