You can then add, “But I will find out.”
Doing that will not decrease you credibility; it will increase it.
You do need to find out how to get answers to question for which you do not have answers. The best possible solution is to dig through the Bible to find it yourself. If you are unsure how to do that, I will help if you need it. The next best is to have a friend who can point you in the right direction. Not give you an answer, but point you in the direction to find it. It is then really helpful to bounce what you found off of them. Again if you do not have a resource like that I am available…
If you engage in this way soon you will have others calling you… Including your kids.