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

A belief in a god is not the problem.

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

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

Why do some of those who believe in a god refuse to consider the possibility they could be wrong?

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

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.

Why do we often have strong feelings for our twin flames, even if they don't feel the same way? Is there a way to make them realize their true feelings for us?

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

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 BIBLE IS THE PROBLEM!

How do the youth in Taiwan perceive their national identity in relation to China?

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?

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

30-Day No-Sugar, High-Fiber, Anti-Inflammatory Meal Plan, Created by a Dietitian - EatingWell

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