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Question: "What is the sinner's prayer?"

Answer: The sinner's prayer is a prayer a person prays to God when they understand that they are a sinner and in need of a Savior. Saying a sinner's prayer will not accomplish anything on its own. A true sinner's prayer only represents what a person knows, understands, and believes about their sinfulness and need for salvation.

For the rest of this answer -- and more -- go to:
http://www.gotquestions.org/sinners-prayer.html

You won't regret it.