Your claim is that in my earlier post I 'extrapolated' from the fact that “there are many "wicked" people. Many of them Christian… to the doctrine of original sin”.
But I've performed no such extrapolation (in other words, I've not inferred from the fact that there are many wicked people, including Christian people, to the truth of the doctrine of original sin), and neither did I endorse that doctrine per se. I could reproduce my original post to show this, but you've already done so yourself, so have what you need.
I think we can still have a secularised version of this doctrine without a secular equivalent of the story of Adam and Eve getting up to mischief in Eden.
If you disagree, and think that results in a 'completely different thing', that's fine: you can safely ignore that, and take me to be merely saying that human beings are inherently wicked and that, absent divine intervention, this is impossible to remedy.