In Acts, Chapter 8, we meet the ultimate outsider: the Ethiopian euncuh.  God commands Philip to go find him.  The Ethiopian has traveled all the way to Jerusalem to learn about the Israelite God.  On his way home, he is trying to study the words of the Prophet Isaiah.  Philip teaches him the true meaning of these words - and baptizes him.  The seeker will now take his faith home.  We are all seekers - and all people are welcomed to the faith.