NO! I'm not gonna talk about religion. However, I am gonna rob a phrase that cropped up in my early days of religious education - "the unforgivable sin" - to make a point.
Let's talk about getting better, every day, on purpose - the process of continuous improvement.
We ALL have flaws, weaknesses, points of vulnerability. Those weak spots could be in areas of our physical health and wellbeing, they could be in areas of our intellectual/cognitive health and wellbeing, or they could be in areas of our emotional/spiritual health and wellbeing. Most of us, in fact, have some limitations in all those areas.
And, most of us will go to our grave with weaknesses that still need our attention and remediation.
So, if we've all got 'em, what's the sin in that?
When we decide that getting better, doing better, learning more is not worth the time or trouble, we have chosen to give up, to not care. In effect, we've made the choice to begin circling the drain.