Do you know that God uses His priests for outside work? 2 Kings 16-20

2 Kings 17:27-28 (NASB)

Then the king of Assyria commanded, saying, “Take there one of the priests whom you carried away into exile and let him go and live there; and let him teach them the custom of the god of the land.” So one of the priests whom they had carried away into exile from Samaria came and lived at Bethel, and taught them how they should fear the Lord.

After the nation of Israel was taken captive by the Assyrians they put other nations into their capital city: Samaria.   Since these nations did not fear God, or even know God, they would abuse the land that God had originally given to Israel.   To stop them from their abuse of the land God sent lions among them to punish them.   The King of Assyria decided to teach those he sent to Samaria the things of God.    To do so he sent a priest, that had originally been taken captive and brought to Assyria, back to Samaria to teach these nations about the things of God and how to Fear The Lord.   Later, in this same passage, we will see that although they did learn how to fear The Lord, they would also continue to serve their own gods.   Never-the-less, this priest had an obligation to teach them about God.   He was sent to his own country to teach non-believers about his God and a God they did not want to honor.   God uses His people in these ways.   God is in the business of teaching, even non-believers, about His ways.  If they don't obey and continue to worship their own gods, that is not the priest's issue.   The priest is to teach God's Word, no matter where and no matter what the result.    Sometimes God takes a man meant for the temple to teach in the trenches.