Why does it matter so much to atheists that God doesn't exis...

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

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.

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?

What pleasure do guys get by sucking female breasts?

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

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

A belief in a god is not the problem.

Which Korean female celebrities look the best in a bikini?

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

THE BIBLE IS THE PROBLEM!

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

What does it mean when someone says "I'm feeling frisky"?

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

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

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