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

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

A belief in a god is not the problem.

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.

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

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

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

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

THE BIBLE IS THE PROBLEM!

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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?

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

When a black man and a white woman have a child, does the child become white? If a white man and a black woman have a child, does the child become black?

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