What I find really annoying is that on this fine Sunday afternoon I have to be bombarded with chain e-mails from my colleagues about "the power of religion and prayer to bring inner peace." We have a service where you can e-mail every single professor at our university at once, which is useful for work related purposes. It's annoying enough that people use this service to find homes for kittens and puppies (accompanying each such e-mail with endless pictures of said dogs and kittens that make your mail-box crash), sell football tickets, houses and cars, and share their general dissatisfaction with the universe. (I'm sorry your students prefer checking their Facebook pages to listening to your ununspiring lecture, but how does it help to fill my mailbox with your complaints?) Inconsiderate as hell, that's what it is.
However, when this service is used to expose me - completely against my will, mind you - to religious propaganda coming from my workplace on my day off, that's simply unconstitutional. We are a state university. The US Constitution guarantees separation of Church and State. This means that at my state university I have a constitutional right to be protected from other people's religious rantings. I don't dump my religion on them, so why do they dump theirs on me? These are educated, well-read people we are talking about. Is it possible that they don't understand how offensive (let alone unconstitutional) their attempts to proselytize amongst their colleagues are?