Thank you for this great question. I think you’ve identified one of the reasons we started RZIM Connect! I think many, many Christians “feel shy in talking to people about the Christian faith or beliefs for fear they would raise a topic where I may be ignorant in.”
The great thing about Connect is, whenever someone pushes you beyond your comfort zone, you can pause the conversation as @SeanO recommended, and say, “‘I don’t know, but I can find out” - knowing that you have this community to help you find the answer and an approach to share the answer with that person in your life.
I think that’s a humble, honest, and caring way to share your faith. It may make it safe for the other person to be similarly candid when you ask them a tough question, and to go think and reflect on it more before coming back to continue the conversation.
So, how to explain Connect to your manager… I’m not sure. I don’t know, but I can find out…
I think the key is to think through the question from your manager’s point of view. Why is he curious about what you are reading at work? What would be likely to increase (rather than decrease) his interest in Jesus?
A few ideas…
“This website is called RZIM Connect. It is an online community with participants from many cultures and perspectives around the globe. People discuss a wide range of issues. I read it because I find it helps me understand my faith more and think about how to treat people with respect.”
Then pause, and see if that leads to a further question or a change of topic on his part. If he changes the topic, no worries. If he has another question, attempt to answer it sincerely.
You could also ask him at some point, “I understand that you’re Catholic. What does that mean to you?” and just listen and understand his self-perception and understanding of God in more detail.
In general, I think taking small steps to gradually open up the conversation are wise. Possibly, the two of you will work together for a couple of years or more. So, build trust and confidence on his part that you enjoy discussing spiritual issues and that it is easy and safe to do so with you. As long as everyone feels respected and valued, I find that many people are willing to really open up and want to have great spiritual conversations. The fear is - I’ll try this, and they’ll jump on me for disagreeing with them or attempt to convert me or judge my lifestyle. But, if they realize, ok, this is safe, and interesting, then they are more likely to consider discussing these parts of their life with you.
At some point, your manager or another employee might ask, “Ok, what does your faith mean to you?” And that’s a great opportunity, in a very conversational way, to explain the gospel and the reason why you decided to follow Jesus.