I heard a message on the car radio last week that offered some diagnostic questions to help discern someone's relationship to the gospel message, and to help address stumbling blocks.
These questions would be most useful with someone to whom you know the gospel has been preached--someone who has been recently attending church, for example, but whose response to the gospel is unclear.
The phraseology and sequence of the questions is intentional. Below are the questions from my notes:
1. Have you ever personally trusted Christ, or are you still on the way?
2. How far along the way are you?
3. Would you like to become a real Christian and be sure of it?
In response to question #3, the speaker suggested walking the person through the key verbs in John 1:12
But as many as received Him, to them He gave the right to become children of God, even to those who believe in His name,