Should i lose marks for not writing “god” with capital letter?
“god” without a capital G is fine, when referring to any god in general. Diana, Zeus, Mars etc are all gods and godesses. It only needs a capital G in this case at the beginning of a sentence. But God with a capital G is a proper noun, just like your name, and therefore merits a capital letter, atheist or not, purely because of the conventions of our language. It also indicates which god you are talking about.