N. T. Wright has an interesting perspective on defining the apostle Paul’s gospel, here is what Wright believes Paul’s gospel is all about in a nutshell:

I begin where Romans begins – with the gospel. My proposal is this. When Paul refers to ‘the gospel’, he is not referring to a system of salvation, though of course the gospel implies and contains this, nor even to the good news that there now is a way of salvation open to all, but rather to the proclamation that the crucified Jesus of Nazareth has been raised from the dead and thereby demonstrated to be both Israel’s Messiah and the world’s true Lord. ‘The gospel’ is not ‘you can be saved, and here’s how’; the gospel, for Paul, is ‘Jesus Christ is Lord’. (quote taken from here)

What do you think?