Me: “I hope you’ve found everything to your liking!”
Customer: “Oh, thank you, I have! It’s so nice to meet a polite Christian girl nowadays! You know, it’s always best to love thy neighbor.”
Me: “Oh, actually, I’m not Christian. But yes, I agree.”
Customer: “Oh. Well, as long as you love Jesus our savior!”
Me: “Actually, I’m Muslim and Jewish.”
Me: “Well, my mother is Jewish and my father is Muslim.”
Customer: “Oh. When I said ‘love thy neighbor,’ I didn’t mean you!”
Undoubtedly the customer is not right in this example. It’s tragic to see religious bigotry so open and explicit. For me, it’s perhaps more tragic that this customer didn’t revise their beliefs upon being confronted with a counterexample that disproved them (a nice person who was not a Christian), but instead went back and essentially edited out the observation of the counterexample.
But the customer isn’t the entirety of the problem here. The submitter is part of the problem, too. Granted, the customer’s way of thinking is obviously more pernicious — actively antagonizing others, expressing hatred to their faces. But the submitter is far from right.
First: you don’t inherit your religious beliefs from your parents. It’s true that you are much more likely to be whatever religion your parents are, because most people don’t question the religious teachings their parents hand them. But this person seems to think that religion is transmitted from parent to child via gametes. Religions are making truth claims about the nature of the entire universe. We’re talking about facts about reality, not hair color or perfect pitch. The true state of reality doesn’t change depending on which chromosomes you have — and only one religion, at most, could possibly be true. You shouldn’t pick your religion based on what your parents believe; you should examine the evidence and believe the things you are actually convinced of the truth of (even if that means no religion at all).
Second: you can’t be both Muslim and Jewish, unless you are using the words “Muslim” and “Jewish” in a magical, special way unrelated to what virtually everybody else means by those words. The statements about reality taught by Islam and Judaism are mutually exclusive. They might both be wrong, but they cannot both be right. Perhaps what she meant to say is that her ethnic background is part Arab and part Ashkenazi, Sephardi, or Mizrahi. Not all Muslims are Arab, and not all Jews are “ethnically Jewish,” so I don’t know. It’s also possible that she meant to say that in her family, they observe both Yom Kippur and Ramadan. But if that’s the case, they aren’t “Muslim and Jewish” — they’re neither.
Combining one and two: you don’t get to have two mutually exclusive sets of truths about reality because your parents contributed roughly equal amounts of genetic material to you! I’m tempted to make a crack here about which religions would be “dominant” or “recessive,” but I’m too annoyed. (Feel free to speculate in the comments.)