The Gemara explains why Judaism is passed on via matrilineal descent: “Rabbi Yoḥanan says in the name of Rabbi Shimon ben Yoḥai: As the verse states with regard to the same issue: “Your daughter you shall not give to his son…for he will turn away your son from following Me” (Deuteronomy 7:3–4). Since the verse is concerned that after one’s daughter marries a gentile, the father will lead his children away from the service of God, this indicates that your son, i.e., your grandson, from a Jewish woman is called “your son” by the Torah, but your son from a gentile woman is not called your son, but her son. Ravina said: Learn from it that the son of your daughter, born to a gentile, is called your son in all regards.”
https://old.reddit.com/r/Judaism/comments/106qd76/is_circumcision_necessary/j3iaq5p/I'm not a Jew so this is of no concern to me, but reading this just makes me angry because it is clearly stupid reasoning and yet they phrase things in such a way that make it difficult to argue against.
Their tactic is to ignore the point and fixate on pointless details, so that if you tell them to stop looking at the details you look crude to the bystander.
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