Practically, I have hardly been challenged/questioned about my faith. People wanting to learn more have asked me questions, and these I can answer to the best of my knowledge. Though I can’t think of any particular incident right now, if I’m questioned about something I don’t have sound knowledge of, I politely tell them that I’m not qualified to answer their question and if they like, they could simply refer it to an aalim. There have been cases where I’ve responded to people with simple logic, without needing to get into theology.