Why does it matter so much to atheists that God doesn't exist?

The people of the modern world have evolved past all of that nonsense.

Because these are not any gods rules we are talking about.

I do not personally care if you believe in a god or not.

Can they start feeding only one meal to prisoners on death row or those doing a life sentence? Because only then will it be real punishment. If they want extra food they can work or pay from their own pocket.

THE BIBLE IS THE PROBLEM!

Those rules that you are trying to reinstate are rules made by men who didn't know anything about the earth, nor anything about all of the other inhabitants of it. How can you not see that?

A belief in a god is not the problem.

Why are so many US conservatives in this day and age still against racial mixing? They won't say it in public, but they are still against the mixing between Blacks and whites? Why?

I am speaking to the US Bible thumpers here, of course ~ many of whom are flat-earthers who deny evolution and see scientists as evil people who are constantly trying, and succeeding, in disproving their beliefs one by one.

And how do you deny hundreds of years of advancement in all fields of science?

These are man made rules - made thousands of years ago for the use of the humans who lived thousands of years ago.

I committed the unpardonable sin. God immediately punished me so that I can no longer think like before and my brain is as if paralyzed and does not work. I've tried everything (confession, repentance, etc.) nothing helps. Any advice?

Notice that I said their rules, not any gods rules.

And then use and ENJOY these fantastic scientific advancements every single day of your life?

My problem is that people who try to shove their rules down everyone's throats - including by physical force - DO EXIST .

These are the 10 open source Android apps I install on every new phone - Android Authority

IT does not matter, mainly because it does not exist.