I know some 'Reformed' theologists that would beg to differ. The short version being that anything not done for the glory of God is not good. And if you're an atheist, you can't possibly do something for the glory of God
‘The short version being that anything not done for the glory of God is not good.’
That’s a circular argument and not worth debating. If you propose that ‘anyone not religious is immoral’, then by definition, any atheist would be immoral.
By the same logic, an atheist could say, ‘anyone who believes in God is stupid’. Therefore, all atheists are smarter than all Christians.