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

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

THE BIBLE IS THE PROBLEM!

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

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

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

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.

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

Nice Hat, Loser - aftermath.site

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

A belief in a god is not the problem.

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

Trump is going to target known criminals in the country illegally for deportation. The Democrats have vowed to fight him every step of the way. Don't they understand this is one of the issues that cost them the white house, the house and senate?

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

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?

I’m Considering Asking My Female Friend to Do Something Many Women Would Never Agree To - Slate Magazine

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