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

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

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

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

NASA Is Planning to Build a Massive Telescope on the Moon’s Dark Side - The Daily Galaxy

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

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

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

Is it socially acceptable for individuals to wear clothing typically associated with the opposite gender? What are some reasons for or against this practice?

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

THE BIBLE IS THE PROBLEM!

What is the most overrated pleasure? Why?

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

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.

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

Im not transphobic/homophobic but, am I in the wrong for being uncomfortable when a trans person comes into the lockeroom? I just dont want them to stare at me while Im changing.

A belief in a god is not the problem.