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

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

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

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.

Where did the false claim that Haitian immigrants are eating pets come from?

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

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?

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

Why do philosophy of physics when you can do physics itself? - Aeon

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

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

THE BIBLE IS THE PROBLEM!

NYC Renters Brace for Price Hikes After Broker-Fee Ban - Bloomberg

A belief in a god is not the problem.

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

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

Is a computer science degree worth it in 2024?

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