The most extraordinary Christian testimony I've ever heard is that of Ian McCormack, the young guy from New Zealand who was stung by 5 Box-Jellyfish off the coast of Mauritius.  He went from being a 24-year old atheist into full-time Christian ministry for over 27 years (church planting, missionary work in S.E. Asia, pastoral care, evangelism, bible school teaching, counseling) and has ministered in over 40 nations around the world.

I listened again to the audio account of his experience in the ambulance.  He knew he was dying and asked God to help him pray the Lord's Prayer that his mother taught him.  Words appeared "forgive us our sins," so he proceeded to ask God to forgive every sin he had ever committed.  Then new words appeared, "forgive those who have sinned against you."  Suddenly the face of the Indian taxi driver appeared, the one who pushed him out of his cab, God asked, "will you forgive him?"  Then the face of the Chinese man, God asked him, "will you forgive him"?  Everyone who's heard this tape knows he had other plans for both men.  But the faces would not go away until he forgave them from his heart.  Then the next words that appeared were "thy will be done on earth as it is in heaven."  Ian asked God, "for the last 24 years I've done my own thing, does that mean I've got to humble myself and turn the reins over to you?"  God answered, "yes."

• Our Father in Heaven, hallowed be Thy Name.  Thy Kingdom come, They Will be done, on earth as it is in heaven.  Give us this day our daily bread.  And forgive us our sins as we forgive those who sin against us.  And lead us not into temptation  But deliver us from evil.  For thine is the Kingdom, the Power, and the Glory forever and ever. (Mathew 6:9-13)

Afterwards, Ian asked  the following questions of God:

1. God, what have I become?  Son, you are a reborn Christian.
    
2. What must I do?  Read your Bible.  (He got his father's Bible and in 6 weeks read the Bible in its entirety from Genesis to Revelation.)
   
3. God, what on earth took place?  In the ambulance, you prayed the prayer of salvation (Mathew 6).  Son, born again is to have your sins cleansed and forgiven.  You give your life fully to me.  (John 3:3, you're born again.)  Those that call on the name of the Lord shall be saved (Romans 10:8).
   
4. God, you mean I got saved, cleansed of my sins, right in the ambulance?  That's right. 

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Below are questions/answers from Ian's website:

• Question:  What about baptism? Were you baptised when you believed?
  Answer:  Yes, I was baptised in water after I gave my life to the Lord. The scriptures teach repent and be baptised { Matt 3 : 2 - 11 } { Luke 3 : 1 - 8 } { Acts 2: 38 }.  Water Baptism didn't save me, the blood of Jesus through repentance did { Romans 10: 7 - 13 } { Heb 10: 19 - 20 }. But the scriptures teach us to die to sin & this world and to follow the Lord into water baptism { Romans 6 : 3 - 10 }.  I was then baptised by the Lord in the Holy Spirit { Matt 3: 11 } { Acts 1: 4 - 5 } { Acts 19 : 2 - 6 } and spoke with other tongues and began to prophesy.  Blessings, Ian
  
• Question:  Why was the Lord's Prayer so important for you to pray in the ambulance?
  Answer:  The Lord's prayer which Jesus taught all mankind to pray was so very important because in it there is (1)  repentance for your sins, (2) forgiveness towards others who have sinned against you and (3) Lordship to Jesus where you pray to do His will in your life and follow Him. So, when I prayed the Lord's Prayer from my heart for the first time in my life in that ambulance, I was actually repenting of my sins and receiving Jesus into my life as Lord and Saviour. Had I not forgiven others that had sinned against me, my sins would not have been forgiven { Matt 7 : 13 – 14 }. Jesus clearly taught that your sins would not be forgiven unless you forgave others. And on the cross in his dying words, Jesus forgave those who crucified him { Luke 23 : 34 }. Unforgiveness and bitterness is a terrible sin in the sight of God.

  I had prayed the Lord's Prayer many times before this night, but it had only been from my mind like a parrot in meaningless repetition. But this was the first time I had prayed it from my heart and given my life to Jesus Christ. Whoever believes that Jesus is the Messiah / Christ is born of God; and whoever loves the Father loves the Child born of Him { 1 John 5 : 1 }. As many as received Jesus, to them He gave the right to become children of God, even to those who believe upon His name, born again not of the will of man but of the will of God { John 1 : 12 }.