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

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

A belief in a god is not the problem.

THE BIBLE IS THE PROBLEM!

How do I stop my 12-year-old daughter from crying herself to sleep? I have punished her and she still does it.

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?

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.

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

Were Dalits prohibited from drinking water from wells in ancient times? Is there any evidence to support this claim?

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

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

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

© you're so funny!

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

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

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

Sometime ago, the Iranian Minister said that a US Navy aircraft carrier would be an easy target for 300 speed boats armed with Katyusha rocket launchers. Is this true?

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