Dear Mr. Harris, I am not sure what has lead you to this place in your life but I would say after you have had your flirtation with sin remember that Jesus forgives all who come to him. If that was the case at the beginning of your faith then it holds true now. Confess your sin and he is faithful and just to forgive your sin and cleanse you from all unrighteousness. God is long suffering to you and will not let go, if you are one of his children, yet he may chasten you for a time. Repent of your sin for Jesus stands ready to forgive you.
I am very concerned to hear of someone in a position of Christian influence such as the Hillsong lyricist claiming that he has or is losing his faith in our Savior. I think we should pray for him that he will seriously consider what that means and repent of his backsliding condition. To lose ones salvation is of course an impossibility and perhaps that teaching has been neglected in his walk of faith. I pray that the Lord will open his heart and he will see the error of his ways and turn yet again to our Lord and Savior, Jesus Christ who is our only hope of eternal life.