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

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

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

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

What's a memory from your childhood that shaped who you are today?

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.

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.

Citadel's Esposito says US deficit is a 'ticking time bomb' - Yahoo Finance

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

THE BIBLE IS THE PROBLEM!

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

Rory McIlroy makes an 8, barely breaks 80 in missing cut at RBC Canadian Open - NBC Sports

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

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

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

What do you think of Obito Uchiha?

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