My 21-year-old son accepted Christ 1 ½ years ago and at that time he said he was delivered from drug addiction. He was successful in staying off of drugs for about 6 months. Now he’s acting just like he used to when he was using. He won’t admit it, but others I’ve spoken to tell me that they think he is. He’s out of work (not even trying to find a job) and sleeps almost all day long.
Receiving Christ has nothing to do with addiction.
If the person recognizes he is a sinner and needs a Savior, Christ is willing to save Him. I think though that many people get spiritually deceived and then the cares of the world come in and snatch away that seed (parable of the four soils) and the person can have a spiritual miscarriage.
I know the power of addiction. My daughter was an addict for seven years and has a year of recovery. Now she is in school to become a certified substance abuse counselor and has a strong walk with the Lord. Being a Christian is a growing thing; it is growing into the likeness of Christ, and that is a process.