6. Suggest Contacting Your Colleague. Rather than providing alternative contact details, you can encourage your users to reach out a colleague. Hey (specify the Name field id)
Whenever you need to step away from the office and won't be able to respond to emails as quickly as you usually do, it is good practice to create an out-of-office email autoresponder to guide your email correspondents on how to reach you, who else to contact, and/or what to do next.

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.
On the other hand, there may be times where you’re so embedded in a project that you truly need to stay connected while you’re out. If that’s the case, say so clearly with a message like this: “I’m away but will be checking messages regularly, so don’t hesitate to contact me directly at any time.” Saying anything less than this may cause people to try to respect your time away and work around you, which in this case could create problems.