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.
In the time before your vacation, remind all of the co-workers on your team that you will be gone for the specific dates while also making sure to note your vacation on all internal company calendars. People are busy and can forget things, especially if those things are not happening regularly. You might have shared that you will be gone two months ago, but it’s something your colleagues may have forgotten. So, don’t neglect to remind everyone, because there might be some problems if that happens. Miscommunication is something that can be easily avoided, as in this specific case.
