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 .

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

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

Why did Donald Trump and Melania Trump sleep in different rooms?

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

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

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

What are the pros and cons of banning homosexuality?

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

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.

Are there any examples of outdated values in the Bible?

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

A belief in a god is not the problem.

THE BIBLE IS THE PROBLEM!

Why did Amazon initially deny leave of absence to Alexis Scott-Windham, the Amazon worker who survived the New Orleans terrorist attack?

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.