There is a difference here between religion and spirituality. In the legal sense, an imposition of religion is something to worry about. This is more about exploration than imposition. I do not agree with imposing a religious point of view, but at the same time we don't need to throw the baby out with the bath water. I believe you can have an exploration, a deepening of the spiritual experience at work without having people become upset with someone trying to shove a particular point of view down their throat.
Nobody likes having points of view imposed, whether it's about religion or any other topic.
The don'ts have to do with trying to shove a particular form of spirituality down other people's throats. People don't like it when you try to force them to think in a certain way. So be light and easy about it. If they accept, fine. If they don't accept, fine.