Well.... yes. Technically you're correct. Human life has no meaning to the "Universe" because the universe has no consciousness. We humans are the ones who assign meaning to life.
Assigning meaning to meaninglessness doesn't alter it's meaninglessness. If a monkey throws paint on a canvas and a human comes along and sees "meaning" in the monkey's "painting", all we have still is a meaningless mess of paint on a piece of canvas.
You are assuming that you understand my belief system... I'm pretty sure you don't, because you can't at this point in your life.
But my beliefs about what's good and bad come from a rational consideration of the consequences of my actions. And we all have some kind of internal compass that does this. Most of us are stuck living in community with others, and we can see that we don't want others killing our babies, so we don't kill others' babies, and it seems good to all of us that we should not allow the killing of babies, so we make it a law. It's quite elementary and I always wonder why this needs explanation.
Do you realize that every society has limits, laws, prohibitions and punishments, whether they follow God or not? Christianity, and more broadly, God, is NOT necessary to point us in a "moral" direction. We decide what kind of society we want to live in and then makes laws and punishments appropriately.
I don't "understand" your belief system? All I need to "understand" about your belief system is the part that says life arose by chance from inanimate matter, there is no spirit world or god(s) and that this life is all there is to existence.
So having "understood" this much correctly, I can then make certain claims about your morality - regardless of what morality you happen to subscribe to or whatever "rational consideration" you employed to arrive at your morality.
Anyhow, instead of calling it your belief system, I will call it your "science".
Btw, your "rational considerations" are as subjective and ultimately meaningless as morality itself. What might seem rational to you may seem irrational to someone else. Besides, which part of your "science" says someone has to behave according to what is "rational", or fair, or for the good of others?
There is no reason for a person to even behave according their own rationality and standards of morality (conscience) - many a thief believes it's wrong to steal and many an adulterer believes it's wrong to commit adultery.
I don't know if I would say that I have "moral superiority" over anyone, including an imaginary God. I do, however, feel disgust and revulsion about certain things, again, stemming from what I think about what I would like done (or not done) to me and what I think is good for society in general.
By criticising the actions of Yahweh you are making a judgement. You are saying, "According to me, your morality is rubbish." In other words, your think your morality is superior. The problem with this attitude is, you cannot prove that your morality is superior, since your morality is based on nothing more than your opinion, and you cannot prove that your opinion is more valid than anyone else's.
On top of this you can't even tell me why it is immoral to kill babies in the first place. Saying you find it revolting or anti-social tells me nothing about why it is immoral.
You may be interested that our world today is demonstrating that the more atheist a nation becomes, the lower their crime rates are, the lower the teen pregnancy rates are, the happier the people are... the list goes on. Societies are better all-around when you take the Bible Baggage away.
There are many many articles on this, but here are 2. I think it's very telling.
I'll have to look into this. Even anecdotally, I'm skeptical. Christianity has done a great deal in terms of curbing uncivilised behaviour (btw, apparently their God, Yahweh, is a monster who thinks nothing of "murdering" babies, so I wonder where all this admirable civilised behaviour comes from).
Consider how drastically Christianity changed the Vikings, for example, who were vicious and ruthless barbarians. Wives in India no longer have to burn alive on the funeral pyres of their husbands. South Sea Islanders are longer head-hunters and cannibals. The Mayans no longer sacrifice a virgin daily to ensure the sun rises. The list goes on ...
Back in the 1950's, were there security guards on suburban trains; drug addicts robbing and stealing and dying in the streets, suicide rates sky-high? One hears stories from old folks about how they would leave their doors unlocked when they went out, or how their children were safe to walk to and from school.