And it certainly doesn’t apply here. Is it ok for a ffb to want to be not religious and we say, oh, no problem, at least you remain a Jew since the goyim will still consider you a Jew.”
Of course it’s not – but my point is that no matter how much we want ALL Jews to be Torah-observant, we cannot eve abandon any Jew for not being religious, and the world will not care one way or the other if he is Shomer Torah u’mitzvos. They will just see the horns.