Actually it is about how we understand it today, because we are responsible to the truth in this age. If an error of understanding entered the Christian belief it most certainly does not deserve to be eternally accepted when we now know better. Just as once the earth was flat and the centre of the universe around which the sun revolved. Scripture is knowledge and all knowledge must be tested and reviewed.
First of all thanks by acknowledging that you are not sure if an error entered or not in Christianity as in "If an error of understanding entered the Christian belief"
I think it would be very wise first to look at ourselves and see how we've been conditioned and influenced to see what we see before we can comment on anything else, especially how people in the past understood things
Jesus is not science, as either he is what he says he is, or he is not, and if he is then that will never change period
