We learn to listen to the beliefs of others with patience and goodwill. We express appreciation for those teachings in harmony with the Dhamma, and keep a polite silence about those in conflict with it. If the person we are speaking to is genuinely interested in our opinion, we express our own views with humility.
As Buddhists we don't want to convert anybody to our religion. What we do want is to support kindness, integrity and wisdom in whatever religious form they appear.
Ajahn Jayasaro