At my old job we had a short script for our voice mail messages including whether we were in the office or out of the office. We were specifically told not to say why we were out of the office for personal privacy and protection reasons. However, an exception was soon made–for jury duty. Callers were getting freaked out when they got the message “I’m out of the office and don’t know when I will return.” They would be worried about the person they were calling and worried about whether or not they would be able to get the info they needed. So if on jury duty we would say, “I’m out of the office on jury duty and don’t know when I will return.”
Apparently it’s a thing where people say in their out of office that they do not intend to read any emails that came in when they were out and your email will be deleted. If you still need assistance you need to resend your email after the person’s return date. While I get it, I’ve been in those positions where you get over 100 emails a day and if you are going to be out and unplugged for a week or more, trying to wade through all the junk and find the stuff that actually needs your attention, I do find this…rude? I don’t know the word I would use, but I have a negative reaction to it.

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.
So, for whatever reason you’re out of the office, your email inbox should be informative with any information about office closures or unexpected absences: Include an expected return date and time. Offer alternative point of contact and their details. Add the general office contact number and email address if you don’t have a specific point of contact. Be friendly and warm in your tone, even if you choose to keep it simple.