Honest questions deserve honest answers. The questions in themselves do not need to denote disagreement, only clarification. A good question can focus a reality and quicken a right response.
When it comes to questions about our faith, we shouldn't simply discount the questioner as the opposition, but rather as a seeker of the truth. There were many in the Word who approached Jesus with questions. He respected them and pointed them to God. May we be so faithful.
Acts 16:30-31 (MSG)
30 He led them out of the jail and asked, "Sirs, what do I have to do to be saved, to really live?"
31 They said, "Put your entire trust in the Master Jesus. Then you'll live as you were meant to live—and everyone in your house included!"