Jesus taught us to intercede for one another, not just the sinner, but also those that are following the Lord. He prayed that we might be delivered from the snares of the Devil.
He taught us to pray: "lead us not into temptation, but deliver us from the evil." Literally, deliver us from the evil one. Notice the pronoun is "us." We should include everyone, even Christians in our cry for deliverance. Let us pray for one another. If any are in need of prayer, ask the Lord to help you with your situation. He is able and He is willing to do it. Believe and ask for His will to be done in you. See the hand of God in motion and watch the prayer unfold in the realm of our atmosphere being transformed by the Holy Spirit.
We need you Lord, We want you Lord. We seek you Lord. We pray. Dear Lord have mercy on me a sinner, I repent of my sins, turn from my wicked ways, and ask you to come into my heart. In Jesus Name.
Even the Christian should pray the prayer of salvation, not because they have somehow lost it, but rather so that they can be reminded that they are Christians and it will encourage those who are not believers to pray too.