A guy in a train from Atlantic City to Philadelphia asked me if I had been "saved". I said "Yes" and pointedly carried on reading my book and he went away to try someone else.
The best defense for that question. I hope I can remember to answer thusly if confronted by an annoying proselytizing fool.
If it is a taboo, how to know other people's faith without offending them?
Americans do not eat dove. It may be used in sophisticated cuisines but the average American would not come across them. They are not generally hunted as a game bird either. Christians of any kind except maybe some small extreme sects have no food taboos. Catholics have a vestige of old fasting rules and should avoid certain foods (meat, dairy) during special times of the year, but they are not followed by all Catholics.
Also symbolism in Christianity is not the same as in Islam for example. Incorrect use or desecration of symbols/articles may receive community disfavor but that would be as far as it goes. There is no extreme retribution either to those in the faith or those outside the faith who don't take symbols seriously. So when a self-styled artist took a crucifix, immersed it into a jar of his own urine, declared it art, and got art venues to show it there was plenty of verbal backlash from a number of groups but virtually no chance of him being killed over it, let alone have some "holy-man" put out a death warrant on him.
I know that there is a loud group here in America that like to demonize religion and the religious. Many, many posts on this site will attest to that. I often wonder how that extreme negative message is received by those of other cultures. For example, in answer to your first question my experience is that you get greeted with an indignant reply or worst when you address non-believers. Few believers would ever be offended by a simple inquiry as to their religion.
Doves are a popular game bird in North America. Hunters are able to hunt doves in the fall months, normally between Sept. 1 and the end of December. Some hunters choose to donate their meat, but others prefer to clean and eat their own game birds. Cleaning doves normally does not require much time because the birds small compared with ducks or geese. With a few household items, you can clean doves and enjoy them in your favorite recipes.
Doves are a popular game bird in North America
When people eat dove, they normally call it squab. Pigeons are squab too.