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

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

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?

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

Is it possible for humans to determine their past life as an animal? Is there a scientific method to prove this?

THE BIBLE IS THE PROBLEM!

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 .

Why is Donald Trump criticized by so many people?

A belief in a god is not the problem.

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

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

Scientists have discovered a hidden city 140,000 years old at the bottom of the ocean. - Farmingdale Observer

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

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?

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