This means that Christianity is not just pious talk. It is neither a collection of religious ideas nor a catalogue of rules. It is a ‘gospel’ (i.e. good news) – in the apostle Paul’s words ‘the gospel of God…regarding his Son…Jesus Christ our Lord’.
It is not primarily an invitation for us to do anything; it is supremely a declaration of what God has done in Christ for human beings like ourselves.
– John Stott, Basic Christianity