Sorry it’s taken me so long to respond, but I was just reminded of the existence of this thread.
Do other branches of atheim claim
There aren’t “branches” of atheism – atheism isn’t some system of thought. It’s the word for not believing in gods. Most people who don’t believe in gods also don’t believe in other supernatural things, like the existence of this weird idea you have called “ultimate meaning.” Some do.
Actually, I’ve never encountered a non-materialist (naturalist/positivist) atheist in any discussions on CAF yet.
I could have sworn I’ve seen a few Buddhists kicking around here – they are often atheists who believe in souls and reincarnation.
I don’t agree that Singer bases his ideas on utilitarianism alone but that his atheistic metaphysic
You need to read more carefully, or maybe you need to learn something about philosophy (probably both). Singer is a well-known utilitarian, and his ideas come from his utilitarian position, and not from his atheism. That this is the case should be obvious from the way that other atheists – myself, as a prime example – reject utilitarianism and Singer’s conclusions.
As to your other points, I think I said this already on this thread, but I’ll say it again: the word “meaning” does not have to refer to this weird idea that you call “ultimate meaning.” The word “meaning” can simply refer to the value that things have to individuals at one particular point in time.
As an obvious illustration of this, I’ll use my car: it has a value right now. It has less value than when I first bought it, and it will have far less value several years from now, and eventually it will have no value and then (in the future) it will not exist at all.
But the mere fact that the car has no “ultimate meaning” or “ultimate value,” the mere fact that the car will eventually cease to exist and cease to have value, does nothing to change the very obvious fact that
it has value now.
The fact that it will one day not exist doesn’t mean that I shouldn’t maintain my car, keep it looking nice, and enjoy taking it for a spin.
And the exact same thing is true of my life. No one needs some magical, imaginary, make-believe “ultimate meaning” to find meaning – real meaning, the only meaning that exists – in their lives right here and now.