Some helpful words from Martyn Lloyd Jones answering the question: What is a Christian?
"You are not a Christian unless you have been made speechless! How do you know whether you are a Christian or not? It is that you 'stop talking.' The trouble with the non-Christian is that he goes on talking. . . . People need to have their mouths shut, 'stopped'. They are for ever talking about God, and criticizing God, and pontificating about what God should or should not do, and asking 'Why does God allow this and that?' You do not begin to be a Christian until your mouth is shut, is stopped, and you are speechless and have nothing to say" (in Lloyd-Jones, Romans: Exposition of Rom 3:20-4:25 [Grand Rapids: Zondervan], 19).
Truth.
"You are not a Christian unless you have been made speechless! How do you know whether you are a Christian or not? It is that you 'stop talking.' The trouble with the non-Christian is that he goes on talking. . . . People need to have their mouths shut, 'stopped'. They are for ever talking about God, and criticizing God, and pontificating about what God should or should not do, and asking 'Why does God allow this and that?' You do not begin to be a Christian until your mouth is shut, is stopped, and you are speechless and have nothing to say" (in Lloyd-Jones, Romans: Exposition of Rom 3:20-4:25 [Grand Rapids: Zondervan], 19).
Truth.