We shall learn from this episode that "Confessing Jesus" is not a requirement for salvation but a product of salvation because we know that salvation is by grace not by works. Confessing Jesus for salvation was made to Christians. It is therefore Christians alone who can have the same mind with God and tell others about Jesus Christ as God would like us to do.

Devil's admitted that Jesus is the son of God but they did not become saved. Admitting historical fact about Jesus cannot save anyone.

You must become save before confessing Jesus acceptably.