I believe your posts have demonstrated with substantial evidence something that no one has refuted, that the more the LGT supporters post, the more obvious their error.
While the idea of original sin is apparently not actually biblical, but arrived at later with other christian teachings, it is illogical / absurd for adherents of the doctrine, and the resulting doctrines relating to salvation through Jesus sacrifice, doctrines that state that sacrifice is to set aside our sin and sinful nature before God, to then turn around and state that they should strive for and can attain a state of perfection of some sort.
Attaining perfection has never been a goal of either Jewish or Christian teachings. Both traditions continue to teach that mortals, sinners, must seek some sort of forgiveness offered by God for their ongoing transgressions, in order to make themselves right with God in some way. There are all sorts of variants on this theme.
Assertions that one has achieved some sort of sinless state of perfection and so they no longer need forgiveness or grace are an antithesis to these traditions, which do actually have biblical roots.