The real answer unfortunately is that they mostly don't. They're an absolutely tiny minority of active religious people and because of that they struggle to take effective group action based on their values or sustain their communities across generations.

Look at the Quakers for a really admirable but ultimately pessimistic illustration of it. A long and almost uniquely sound history of true dedication to causes of human freedom, safety, comfort, and thriving, but with no shared creed per se. At times united in their activism and influential because of it (abolition, prohibition, civil rights). Now generations removed from any unifying cause, they are fragmented into an entire continuum of irreconcilable beliefs; fewer than half a million left globally. And the only thriving, growing communities among them are in africa, with belief and worship virtually indistinguishable from the local main stream of evangelical christianity.

Whatever it is that makes religions culturally impactful does not seem easily separable from whatever it is that makes them religions. People have tried over and over, not all of them completely unsuccessfully. But I don't know of any with the kind of durable cultural influence we see in the mainstream religions that don't value or attempt that separation.