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

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 .

A belief in a god is not the problem.

Relocating to Sweden to save money. I got a job offer of 47000SEK before tax, visas sponsored for my wife & my mother (with a laryngectomy). My wife, a general medicine graduate, wants to specialize in Sweden. Can we live well and save 4000€ monthly?

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

THE BIBLE IS THE PROBLEM!

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?

Why do some people feel down in summer, specifically in July and August? What could be the reasons behind this feeling of sadness during those months only?

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

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.

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

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

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

Why do Muslims not get HIV/AIDS in spite of having 4 wives and multiple relationships?

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