In my understanding, the command to rebuke a sinner only applies if we have reason to believe the sinner will listen. As example, an atheist Jew who breaks Shabbat and won’t listen to rebuke there’s not obligation to rebuke them. My question is, conversely, if one claims faith in Judaism but is a non-halachic convert, is there obligation of rebuke against them? Because as example gentiles aren’t supposed to keep Shabbat to some views.
As example, in my life I am acquaintance with a “convert” under a conservative beit din (one of the three on it was a woman “rabbi”), he claims to be “non binary,” is gay, and thinks he’s a Jew. Should I explain to him (since he nominally believes in Judaism as a framework) why his “conversion” has no validity until he goes before an orthodox beit din so he won’t do things like observe Shabbat or serve Jews wine.
