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 .

THE BIBLE IS THE PROBLEM!

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

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

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

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

What is the reason that Worcester, Massachusetts is not as well-known as Boston and Springfield, even though it is a large city with many neighborhoods?

A belief in a god is not the problem.

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

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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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?

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.

Why do gun owners feel the need to defend themselves with deadly weapons? Can they not just talk things out like civilized people do?

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