If the gospel isn't good news for everybody, then it isn't good news for anybody.
And this is because the most powerful things happen when the church surrenders its desire to convert people and convince them to join. It is when the church gives itself away in radical acts of service and compassion, expecting nothing in return, that the way of Jesus is most vividly put on display. To do this, the church must stop thinking about everybody primarily in categories of in or out, saved or not, believer or nonbeliever. Besides the fact that these terms are offensive to those who are the 'un' and 'non', they work against Jesus' teachings about how we are to treat each other. Jesus commanded us to love our neighbor, and our neighbor can be anybody. We are all created in the image of God, and we are all sacred, valuable creations of God. Everybody matters. To treat people differently based on who believes is to fail to respect the image of God in everyone. As the book of James says, 'God shows no favoritism.' So we don't either.
This is a controversial statement no doubt, but the point of the church surrendering itself to radical acts of service and compassion, expecting nothing in return is something we have lost to a significant degree. Yes there are pockets of radical service, however, we as an entire church body could hardly be characterized as being involved in radical acts of service, nor could we as individual members of churches be characterized as involved in radical acts of service (I count myself among these individuals).
But what is the example of our Lord? Somehow, I need to make the radical acts of service more important than the probably thousands of hours I spend with my children or on my own in sports activities, for example. If we are doing anything radically, we are missing the example of Christ in a radical manner.