A reader writes:
I am a fauclty member at a private college associated with a Protestant church. I’m a convert to the Catholic Church.
There is a chapel service two days a week here and the opportunity has come up for me to speak at this service. Am I allowed to speak at a service like this?
Yes. Canon law does not prevent you from speaking if you are invited to do so.
If so is what are my obligations with regard to what I reveal to the assembled people?
You must not say anything contrary to the Catholic faith. Within that constraint, you should seek to deliver the kind of talk that your hosts expect. (E.g., if you are asked to speak on a particular topic or Scripture passage, you should do so.)
In addition, to the extent you can (without endangering your ability to make a living, for example) you should seek to introduce them to aspects of the truth (the Catholic faith) that they may not have considered. This may involve revealing the fact that you are a Catholic or it may not.
If you perceive that the topic you are asked to speak on could draw you into areas that would be problematic (e.g., if you couldn’t talk about the topic without getting into a subject that would cause you to lose your job) then you could ask for a different topic, a different day (i.e., one with a different planned topic), or simply decline the invitation to speak.
That’s about the best I can do with the limited information at hand (I don’t know, for example, whether people at the college would freak out upon learning that you are Catholic and demand your resignation or firing; that’s been known to happen at some Protestant schools, even when the administration is initially supportive of Catholic faculty members). The bottom line is: Do what good you can and be prudent as you do so.
Or as Our Lord put it: "Be wise as serpents and innocent as doves" (Matt. 10:16).