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

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

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?

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

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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.

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

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

How do people move on so quickly? I’m still sprung over someone I was dating and he found someone else so fast. I feel hurt because I’m still head over heels over him while he’s out enjoying his life with someone new

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

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

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

Have husbands and wives ever had a threesome with someone in real life? How did it happen?

THE BIBLE IS THE PROBLEM!

A belief in a god is not the problem.

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

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