How does one become a Christian?
There is only one way to become a Christian. We must sincerely invite Jesus into our lives to be Lord and Savior, and allow ourselves to be born anew. When we do, we find new life in Jesus Christ and become a child of God. Through this transformation we find peace, joy and courage to live a victorious Christian life. The choice is ours. God has given every person the free will to accept or reject his offer of grace. It is not something we earn but is freely given. Jesus already paid for it through his death on the cross.
If you declare with your mouth, “Jesus is Lord,” and believe in your heart that God raised him from the dead, you will be saved. For it is with your heart that you believe and are justified, and it is with your mouth that you profess your faith and are saved.
Romans 10:9-10 (NIV)