Religious apologists often confuse the word objective with words like absolute, transcendent, and universal--especially when talking about morality. To illustrate what objective means, I will now insult these people.
They are stupid...at least in the subjective sense, which is a judgement I'm making influenced by personal feelings and opinions. However, in the recent past, I could test these people and state objectively that they are morons, imbeciles and idiots--each of these labels corresponding with an IQ score of 51–70, 21–50, and IQ of 0–20 respectively. A metric, like an IQ score, means that feelings and opinions can't factor in. Your IQ is your IQ regardless of what I personally think of you, and therefore objective.