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

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

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?

A belief in a god is not the problem.

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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.

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

I’m a 25 year old teacher teaching at boys school & I have colleagues younger than me. I caught one of my students telling her he wanted her as his teacher instead & it hurt my feelings. They compliment her a lot. It makes me jealous. What do I do?

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

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.

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

How do professional musicians handle their equipment during gigs? Do they bring their own or use the venue's sound system?

THE BIBLE IS THE PROBLEM!

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?

Why is the mainstream media, traditionally liberal except for Fox, not reporting on Trump like he's a traditional candidate who has ideas, values, and a concern for the common good?

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