Those who live a Christlike life even though they have never heard or don't believe the central message of the gospel maybe?
How's that done without faith?
DD - what does faith have to do with it? It IS possible to display/live by Christlike qualities - you know the ones - like love your enemies, do good to those who hate you, forgive without seeking revenge or repayment etc - WITHOUT having faith in the sacrifice of Christ.
There are plenty of non-Christians who do this:
"Then the King will say to those on his right, 'Come, you who are blessed by my Father; take your inheritance, the kingdom prepared for you since the creation of the world. For I was hungry and you gave me something to eat, I was thirsty and you gave me something to drink, I was a stranger and you invited me in, I needed clothes and you clothed me, I was sick and you looked after me, I was in prison and you came to visit me.'
Likewise, there are plenty of "Christians" who do this:
"Then he will say to those on his left, 'Depart from me, you who are cursed, into the eternal fire prepared for the devil and his angels. For I was hungry and you gave me nothing to eat, I was thirsty and you gave me nothing to drink, I was a stranger and you did not invite me in, I needed clothes and you did not clothe me, I was sick and in prison and you did not look after me.'
"Then they will go away to eternal punishment, but the righteous to eternal life."
Faith in the promise of a Messiah is what caused them to do the works they did.
Did they have faith in the promise of a Messiah? A Messiah wasn't promised until later in history. Rahab wasn't even one of the chosen people, how could she have had faith in a Jewish Messiah? In fact, reading the account, she was 'merely' negotiating with the spies to save herself and her family - and working within God's will - as opposed to turning the spies in. I might hazard to guess that they had faith in God's power, justice and mercy.