What does God expect us to do for other cultures and faiths

I think God wants us to do what Don did with the Sawi for other cultures and faiths. Every faith or culture has something that can be used to show the people who God is, what He did, and what He wants for us. For example, the Sawi had the peace child, and I believe that other cultures or faiths will have a 'peace child' that can be used to show them the Gospel. Now, when we do share the Gospel, we don't want to blow the other faith/culture out of the water, because then they would most certainly be against it. However, if we live out the gospel, and slowly integrate it into the other faith, then, when it comes time for us to show them the differences, they will be more receiving, and won't reject it outright. The people might still reject it, but by working the gospel into their daily lives, they become more accustomed to seeing it, and aren't caught completely off guard. For example, had Don gone to the Sawi (had he been proficient at their language right away) and told them about the Gospel flat out, they would have little reason to trust him, or believe what he was saying. However, by living out the gospel, and showing them by how he lived, he gained their trust, and, with that trust, taught them about the Gospel, and they received him, because he had earned their trust.