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

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

IT does not matter, mainly because it does not 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.

What is the most comfortable heel height for women's dress shoes and what are the differences between wearing high heels and lower heels?

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

A belief in a god is not the problem.

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

What real evidence is there to believe in legends such as the story of Atlandida or the lost continent of Lemuria?

THE BIBLE IS THE PROBLEM!

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

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

Is it ok for someone to crossdress in public?

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?

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

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

How do so-called Religious/Christian people really think homosexuality is even a sin? That would be nonsense. In fact, LGBT people need love instead of contempt/hatred. The word Homosexual didn't appear until the 1850s.

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