For two millennia people have fought over who is and who is not a Christian. Some base the standing upon a work like baptism, others a doctrinal understanding, some an association with the “correct” people, and others abstaining from “those” actions. If we are going to ask if we are truly Christians, we ought to at least have a consistent method for examination (don’t worry we do, and it the Bible).
Definition of a Christian: those who are believers in Christ who are saved by God’s grace through faith and have been sealed with the Holy Spirit of promise.
1. Have you believed in Christ? That is, have you trusted in Him, admitting your sin, believing He died in your place, and confessing your inability to save yourself? (John 3:16-21, Romans 10:9,10, 13, Ephesians 2:8,9)
2. Are you sealed with the Holy Spirit? While some teach a need for a “second blessing” to receive the Holy Spirit, all who have believed in Christ were immediately sealed and baptized by the Holy Spirit (1 Corinthians 12:13, Ephesians 1:13, 4:30).
If you are a believer in Christ, you are a new creation. You are a Christian. You may not always feel or act like one, but you are held without being able to be lost (John 10:27-30). If you have not believed, begin reading through the Book of John, which plainly declares salvation of Jesus Christ.