There are many people who in this world who are constantly on the move from one religion to each other. Some of these people think they are “saved” because they said a prayer to Jesus at one point in their lives. However, a true believer in Christ is one who does not leave Jesus and give up the gospel for some other philosophy:
He has reconciled you by Christ’s physical body through death to present you holy in his sight, without blemish and free from accusation— 23 if you continue in your faith, established and firm, and do not move from the hope held out in the gospel. (Colossians 1:22-23a NIV)
If you do not continue in the Faith of Jesus Christ, and substitute some other “hope” for the hope of the gospel, then you have not been reconciled to God. He is still your enemy.
God’s true Children are those who have repented of their sins and know that the blood that Jesus shed on the cross is the ONLY way that they can be at peace with God (John 14:6).