The universe is uncaring, how much evidence do we need - its is surely self-evident.
That is a normative statement. When you use terms like uncaring, you are making judgements on what constitutes caring, and what does not. You make a moral, or value judgement. On what foundation can you make that statement?
My argument against God was that the universe seemed so cruel and unjust. But how had I got this idea of just and unjust? A man does not call a line crooked unless he has some idea of a straight line. What was I comparing this universe with when I called it unjust? If the whole show was bad and senseless from A to Z, so to speak, why did I, who was supposed to be part of the show, find myself in such violent reaction against it? A man feels wet when he falls into water, because man is not a water animal: a fish would not feel wet. Of course, I could have given up my idea of justice by saying that it was nothing but a private idea of my own. But if I did that, then my argument against God collapsed too--for the argument depended on saying that the world was really unjust, not simply that it did not happen to please my private fancies. Thus in the very act of trying to prove that God did not exist--in other words, that the whole of reality was senseless--I found I was forced to assume that one part of reality--namely my idea of justice--was full of sense. Consequently atheism turns out to be too simple. If the whole universe has no meaning, we should never have found out that it has no meaning: just as, if there were no light in the universe and therefore no creatures with eyes, we should never know it was dark. Dark would be without meaning.
That's fine by me but lets not pretend its anything other than a 21st Century American, Johnny-come-lately, let's all feel good about ourselves, version of the gospel.
If that were the case, you would possibly have an argument. I recommend you investigate historical non-Protestant teachings on sin and justification.
How many christians would admit that the natural world is pure carnage and that god made it that way?
The world is still in a state of becoming. We have a role to play in its future. That is part of why we are here.