I'll preface this by saying I'm not an informed philosophy academic, but merely bothered.
I've heard that conservative political columnist Ben Shapiro is currently writing a book about how he hypothesizes that the stem of the recent political shift to tribalism and identity politics is rooted in modern philosophy -- off the backs of people like Hume and people that say that "God does not exist" and back the is-ought problem. This has caused a diversion from more ancient Aristotelian, Platonic philosophy that has become a foundation for Judeo-Christian values and caused less of a "love your neighbor" mentality and more of a "us versus them" thing.
The thing that has bothered me a lot recently about this is the following. Our only way of knowing if people's adoption of tribalism from more modern philosophy is working or not is by looking, for example, at countries which are currently left-leaning and expedient with these beliefs. Our only way of knowing people's adoption of Judeo-Christian values is working, or "the right way of seeing things" is by looking at the benefits of the Renaissance and America's development up until around the 1970's. I'm not satisfied with this.
If Judeo-Christian values, for instance, produce a more productive society, but demand you accept certain unsubstantiated things (core tenants of Christianity that justify you acting like a good person) to act a certain way, it seems like convincing us of baseless things are the only way to live in a productive society, and this is truly a depressing thought. To me, some of the more modern viewpoints seem to look at life more concretely, but are far less productive beliefs to adopt.
So, I'm presented with a difficulty - is it true that the only way we can act as good people is by believing in subjective things?
I feel like nothing, no belief has any credence on how we should live our lives because it's fundamentally unsubstantiated. But I don't want to think in such a bleak way. As a physics student and agnostic, I have huge reservations accepting things blindly, but it ends up making me very confused about fundamental values of being human -- how can anyone be right? And if no one can be right, why is anyone given any credit? How on Earth am I supposed to think about life without lieing to myself?