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

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

THE BIBLE IS THE PROBLEM!

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

Owen Wilson Brings Clever, Funny “Stick” in Under Par - Roger Ebert

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

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

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

Why don’t people show patriot Donald Trump the respect he deserves? He’s successful in business, politics, and with the ladies.

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?

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

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

I Tasted 7 Chocolate Ice Creams and One Was a Clear Winner - Eat This Not That

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

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.

A belief in a god is not the problem.

There is any scientific evidence that we live in a sphere. Why do others say that we lives in a flat Earth but there is no evidence that they have proven the existence of a flat earth?

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