Atheism

Absolute truth may ir may not exist, but humans and all our interpretations are subjective.

... and if God wanted us to know an absolute Truth that would violate our free will, it might also make someone go crazy. Which is the internal reasoning for why faith is required for most religions (externally/critically it's because non of them make coherent sense).

Slap a "for me" any statement becomes subjective, even your "I don't believe in absolute truth exists".

...and what's more, to go one step further, I don't think the belief in an absolute truth is as comforting as we pretend it must be. He sounds very uncomfortable to the point it's bothering him, and interrupting his daily interactions with others.

Sounds like a mental health issue to me... And like many mental health issues, I think it comes as a way to avoid and protect ones self from trauma. In this case the truama of living in an ambiguous world, where there's not a simple set of answers available.

Religion holds people back, keeps them attached to an easy set of inauthentic beliefs that operate on false ideas of the world... And that's my subjective viewpoint argued with reason, which for almost all intents and purposes is qualitatively better than operating on faith.

The concept of absolute truth is, ironically, the lie that exists at the heart of thiest religion. It provides a comforting certainty to them where they don't have to do any thinking or work out what their own opinions are on a given subject - they can just claim there is a set of absolute truths and that their particular god is the sole arbiter of that truth.

The only absolute truth that I can descern is the mathematical construct of perspective that governs objects apparent size relative to the distance they are from an observer.

To some degree religion encourages that mindset, but it doesn't create it. In fact, to a notable degree, it's exactly the opposite - the desire to believe in some absolute truth is a lot of the reason that religion came to exist in the first place. It provides the absolute (nominal) truths that reality does not.

In a way, your friend is right - the lack of absolute truth is at the heart of a lot of the world's problems. But that's not it by itself - it's actually the lack of absolute truth in concert with the desperate need so many people have for it. There are a great many people for whom absolute truth is not necessary - who are perfectly content with the simple fact that reality is murky and complex and largely inexplicable and that our perceptions of it are necessarily subjective. They - we - don't feel the compelling need your friend obviously has for absolute truth - we get by fine without it.

But for the many who can't cope with that - who can't or won't accept nuance and complexity and inexplicability and subjectivity - yes, the lack of absolute truth is certainly a problem.

The thing is though that the universe isn't going to change. Absolute truth isn't going to suddenly make itself manifest because a bunch of conscious animals desperately yearn for it. The universe is going to keep on being unimaginably complex and largely inexplicable, so it's up to people to come to terms with that.

So as far as that goes, your friend is terribly, terribly wrong.

And in fact, I think that the way in which he's wrong is actually one of the biggest sources of misery in the world. It's not just the absence of absolute truth, but the fact that a great many people, in the face of the absence of absolute truth, just go ahead and pick something and pretend that it's absolute truth anyway, even though it's self-evidently not.

That does two things immediately - it distances people from sound reason, and it sets them against all of the people who doubt their make-believe absolute truth, and especially those who have chosen to believe some other make-believe absolute truth.

I would say that if one were to dissect virtually any overtly destructive belief system - the sorts of things over which people will and do kill each other - one would find that basic error lurking at its heart.

So yeah - in a way, the lack of absolute truth is a problem. But your friend's way of approaching that fact is entirely and completely wrong, and is the real problem.

This sounds to me like an example of locking into a solution, then mistaking it for the problem. I think societies are broken in which there is deep disagreement about how to decide what's true. Recognizing some kind of absolute truth is merely one way to agree on how to decide what's true.

Moreover, I expect that a person claiming that absolute truth exists means something more like there is only one reliable source of truth or way to decide truth. Some choose reason and some choose their preferred god.

It is natural for humans to want simplicity and absolute truth seems simple. Humans have evolved not to waste energy on deciding what's true. What an advantage it would be to live as though truth were absolute!

Absolute truth is hard when there are nuances thatbwould require an infinite amount of words to accurately reflect the accuracy of the situation

When I told them that I dont think absolute truths exists he told me that was an absolute truth I believed

Then he wasn't listening to you. "I don't think" is not the same as "I am certain."