Your verbose treatise confuses absolute morality and objective morality.
The christian believes in a Platonic essential good out there somewhere against which everything must be measured. It is a childish desire that atheists have outgrown.
It also leads to worse sort of depravity. Christians appeal to the bible as a source of knowledge about absolute morality and are forced to become apologists for slavery, rape and infanticide. I have personally had many christians explain to me why slaughtering thousands of babies in cold blood was a moral good when god commanded it.
This sort of morality is nothing more than ethics by divine fiat and is directly responsible for the greatest crimes in human history.
On the other hand moral truths do exist. Right and wrong are not personal opinions like the best flavour of ice cream. The choice between absolute morality and relative morality is a false dichotomy.
Objective morality is about the well-being of conscious creatures. It is this post-enlightenment insight that has led to the greatest progress in human ethics in recent decades.