I loved how you were able exclude predetermination from your explanation of purpose. Though to an extent it feels our purpose has been predetermined just like our faith. For instance most people are a product of a particular religion because they were born into the family, a decision had no say in. Only a few get to switch as they grow older and more knowledgeable about want they want for themselves.

It is understandable that our primary purpose is to serve our creator but it shouldn't stop us from finding other purposes that would add meaning to our existence as an individual.