How to tell if someone is a Christian?

I came across this video on YouTube, which features seven people who claim to be Christians in conversation.

The point is that only six are professing Christians and one is an atheist masquerading as a Christian. Through questions, the participants try to guess who is the imposter and vote them out. It is an interesting exercise.

Personally, I have some doubts about the credibility of some of the others who claim to be Christians as well, but that's beside the point.

Of more interest is to ask, how would we try to determine if somone claiming to be a Christian is genuine?

I don't think the questions asked in the video were very good. No one seemed to ask or talk about God at all. No one mentioned Jesus or the Holy Spirit. No one referred to prayer or Bible reading. At least not in the edited version we see in the video.

These are the kind of questions I would probably ask in this scenario:

• What led you to become a Christian?
• What kind of church do you attend?
• What Bible translation do you mostly read?
• What's your favourite Bible verse?
• What's your favourite hymn or worship song?
• Do you serve in any capacity at your church?

Of course, someone deliberately setting out to deceive could probably come up with answers to these, so who knows. In my experience, most Christians are very willing to accept someone's profession of faith as genuine.

More important than our personal "tests" is to see what the Bible says about what makes a Christian. Some relevant verses are the following:

• A Christian is someone who has been born again by the Holy Spirit. The phrase "born-again Christian" is a redundancy. See John 3:3-8.
• A Christian is someone who has faith in Jesus to save them. See Acts 16:30-31, John 3:16
  
• A Christian is someone who seeks to follow Jesus in obedience to his teachings. See 1 John 2:3-6.
• A Christian is someone who confesses that Jesus is Lord and believes that God raised him from the dead. See Romans 10:9
• A Christian is someone who seeks to turn away (repent) of their sins. See Matthew 3:2, Mark 1:15, Acts 2:38, 2 Peter 3:9.

The folk in this video seem to associate being a Christian with going to church and maybe having some kind of spiritual experience. I was quite shocked that none of them mentioned a personal relationship with Jesus or God the Father or the Holy Spirit.