I have come to the conclusion that no one really truly believes in God. They think they do but when the chips are down most will revert to an animal state. Kill or be killed, survival of the fittest, etc. I am fortunate that I work for an extremely progressive company where he would be set straight or let go if he kept up this chatter.

'Blessed be' is how pagans greet each other. Generally meaning, 'enjoy the fruits of your labour and the joy the world has available'.
[learnreligions.com]

I think some people use 'blessed day' the way other people use 'Oh God', it doesn't really mean anything other than have a good day.
Personally I find being honest about my atheist views but not pushing them has been good.
I hear 'Everything Happens for a Reason' A LOT! And crazy part is it's from my pot smoking, heavy drinker, nudist Christian friends... I usually reply gently, that I don't like that phrase that I prefer to think, "With the right attitude most situations can be an opportunity to learn and grow into something better."
Most of the time the response is WOW, I like that a lot better.
If they push I'll say, I don't like the idea of someone or some entity intentionally bringing pain.
This past weekend someone I talked to that way, gently, not from a place of offence, actually came to me and shared that she is having doubts about her faith.
We need people who give the 'hail satan' response, but I think a gentle response goes a long way as well.

A physician's Assistant (PA) use to say, "Have a Blessed Day" as he was going out the door after an exam. He never dwelled at the door long enough for me to tell him his comment was inappropriate and leave religion out of my medical exams. He didn't last very long at the doctor's office. And I never said anything to my MD. Otherwise, he was a great PA.
I'm glad I'm retired and don't have to deal with religious bosses.

Yeah....good luck with that......or, you could spit in their face.after thinking it over...that might be too much like an assault

For me I could care less it's a group of words, if someone wishes me a good day I wish them the same, with the qualifier, unless they made other plans. If I wish somebody a good day I wish them a good day and follow up with, unless you made other plans. that way it's up to them.

This should end well. Please keep us updated.

I understand your frustration. It may be considered to be nice, but on some level, it's still an assertion that their beliefs are relevant in the work place. I saw a truck today advertising pest control, with Jesus fish symbols on it. I guess that was a signal to Christians that they should assume the business was more honest and scrupulous than none Christian bug killers?

Annoying, and yet another of many ways to assume a belief in the supernatural is the norm.

I say "I guess that's better than having a cursed one."

I work as a graphic artist, and get that sort of thing all the time from religious clients. Annoying though it is, I do not take offense, as they are just trying to be nice in the only way they know how. If, however, your manager knows you are a non-believer, and is saying it just to irritate you, then perhaps you have a right to go on the offensive. I do not, though, see where referencing an Abrahamic archangel to demonstrate that you don't believe in Abrahamic religions is in any way beneficial. Of course you could try something totally outrageous, like explaining to the person that you are a non-believer and it would make you happier if they just said "Have a nice day", which, while not nearly as dramatic, might make things run smoother at the store. As always, the decision is entirely yours. Have a mediocre day.

One might as well be offended with the ubiquitous “Bless you” after you sneeze. Personally, I prefer “gezundeit,” as I am of German ancestry, and also because as a kid, I thought the word ‘gezundeit’ was more fun to say than the banal ‘bless you.’ I also think it’s better to save your offense for commonly heard comments which are far more offensive, such as, “someday you’ll see the light,” or “I’ll pray for you” in response to someone saying they are atheist.

I agree with Vivian but you could also reply with "so be it." This will go into Wiccan ideas but is also a literal translation of "amen."

I would act shocked and say, "Cool, I didnt know you are Wiccan". If they're Christian, they'll stop saying it for fear others will think they're Wiccan. Lol

Such a statement does not seem to be an attempt to foist his religion on people but rather to convey good wishes for others to have a good day. Since the intent behind this wish is kind, of course coming from a religious person, I would look to the intent. Having no ax to grind, nothing to prove, I would just accept his good intentions and respond: Have a beautiful day, too and thank you.

It's funny but pointlessly confrontational. They are obviously trying to be nice. So what if they're including their superstition, why would that be offensive? You sound a little "snowflake".

I would say that's an appropriate response.. if you believe in satan. I prefer less friction in the work place. If they try to make it more personal then bring it ti her superiors attention if you feel you need to respond to her say something innocuous like don't "get run over" ..i prefer humor I guess.

I think that people who offer such a salutation do so with a positive attitude, and do not realize that to a non-religious person is it somewhat offensive. I do not like it when someone says that to me, but I take it in the spirirt in which it is intended. I might smile, or I might simply ignore it. I try to not let it upset me, and I would certainly not want to engage horns with someone who might have the power to make the job either miserable or disappear!

One of the meanings is for blessings = good fortune, so why not just take it as another version of: Have a nice day?

good idea - piss off the guy that decides how your day will go - and probably what you get paid. Ignore the man or respond as Dave Allen (irish comedian) - may your god go with you - and one day it will

just blow it off...

Irritating

That phrase is exceeding condescending

It irritates me as well... mostly because I don't like being told to do anything...no thanks, I prefer to have a shitty day...ugh

I’ve noticed religious dog whistles a lot more lately. I guess I’m more sensitive or annoyed by it now. But I just shrug it off. A couple weeks ago, I was asked to pray after a game. LOL So awkward.