I don’t know a situation in a hotel, but in real life; this could also be possible in any hotel reception. In a group of people who met on airport, between flies, even though one of them just landed from Tel Aviv, (at first sight, in discussion) someone else just identify him, a Jewish indeed, as Christian. Reaction was under gravity of situation but are many facts to consider. If person doing this mistake was under a hotel uniform, this could affect image of the brand, even a bad publicity or worse.
As receptionist, assuming, labelling someone, mistakenly identifying a Jewish guest as “Christian”, it can lead to a cultural misunderstanding and potentially offend the guest. Can not create attributes to a guest or a religious affiliation based on their name, or appearance, or other cues.  The receptionist might not have had a thorough understanding of the diverse religious backgrounds and practices. They may have assumed that the majority of guests are Christian. The receptionist may not have intentionally meant to cause offense but may have been unaware of the potential sensitivity surrounding religious identification, proving an unintentional insensitivity Most important is this kind of situation to be avoided in the future” Errare humanum est, sed in errare perseverare diabolicum” (Seneca), in English "It is every man's to err, no one’s except a fool to persist in error”. “Interculturality seems to meet at the crossroad between individual experiences and collective understandings about cultural relationships.”(Thije., 2006, p.170) Where the individual experiences are not on heigh of expectation, these could be improved. Receptionists should undergo training to become more culturally aware. This includes understanding different religious practices, customs, and sensitivities. Should gain knowledge about various religions, including their practices, holidays, and customs. Also to develop strong active listening skills. When in doubt about a guest's religious background, it's better to ask open-ended questions in a polite and non-intrusive way to get to know the guest better. As my grandmom use to say “if you work you could prove sometimes wrong” but “who commits an error and does not correct it, commits a second one” (Confucius). First thing is to apologies, then to adopt next behavioural changes: Make it a practice to avoid making assumptions about guests' religion or any other aspect of their identity. Treat each guest as an individual without preconceived notions.  Respect the privacy of guests regarding their religion or any personal information. Don't pry into their beliefs or practices unless they voluntarily share. If a receptionist wants to provide a guest with information or services that may be relevant to their religious practices (e.g., dietary preferences or prayer facilities), it's better to ask politely if they have any specific needs without making assumptions. Be cautious about the language used when discussing religion. Use neutral and inclusive language to avoid any misunderstandings or offense. Encourage receptionists and staff to engage in ongoing learning about different cultures and religions. This can be through workshops, courses, or simply reading about diverse traditions. Promote diversity within the staff and management to foster a more inclusive environment. When people from different backgrounds work together, it enhances understanding and empathy. By developing cultural awareness, active listening skills, and a respectful approach to diverse guests, receptionists and hotel staff can reduce the chances of cultural misunderstandings in the future and provide a more welcoming and inclusive experience for all guests, regardless of their background.




References
Ika, S. (2000), Overcoming Cultural Misunderstandings, chapter in Inclusive Education, edited by Suzanne E. Wade, Routledge, 1st Edition
Maheshkar, C. and Sharma, V. (2018) Handbook of Research on Cross-Cultural Business Education. HersheyIGI 
Thije, Jan D., Bührig,K.,(2006), Beyond Misunderstanding- Amsterdam John Benjamins Publishing Company, 2006