As your email will not be forwarded, please contact in the meantime my colleague, Mary, 0912345678, [email protected].
I wouldn’t be offended or consider saying anything to anyone who included this in their out of office message, but even as someone who is in a religion that forbids use of electronics on most holidays, I still think this message is 1) TMI; 2) doesn’t convey what it needs to convey unless you are explaining that you don’t use electronics during holidays, in which case you can just include that you won’t be checking email without including the religious explanation; 3) would come across to me as inclusion of personal information I don’t need, which would therefore strike an unprofessional tone,and I wouldn’t understand why you felt the need to include that info. How about “I’m out of the office without access to internet or email until (date). If you need assistance before this date, please contact…” Like I said, I think your colleagues are overreacting, but in general I would advise to leave all personal information out of your auto-reply — vacation, medical leave, religious observance, etc. — people do not need to know why you are out.

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We are closed on [your business' closed days]. Please leave us a message with your name, number, and any other necessary information, and we will return your call when the office reopens. Thank you for calling." As you can see, this professional voicemail greeting is similar to the absent receptionist greeting but more inclusive.