The cross, or rather Christ’s death upon the cross, is the only hope of mankind. It is the only means to salvation, the only propitiation of sin, and that completion that was intended and expected in the Mosaic law. This is all true. However, when I make my faith entirely about the cross, what I inevitably wind up saying is that my faith is about me, and this is the problem.
I need the cross. It is my hope and my salvation. God does not need it, because God does not need me. He’s perfectly fine on his own and there is nothing that I can do for him which he cannot do for himself. The cross has an important, irrevocable place in the Christian faith, but it should not be the center of that faith, because we should not be the center of that faith.
We often say that ‘If only one man on earth had ever sinned, Christ would have come to save him’, and I don’t actually disagree with this claim in anyway. God loves us and he wants us, this is made clear by the fact that the father would sacrifice the son so that men might be saved. However, when I hear this I often respond with this question: ‘If saving man hadn’t glorified the Godhead, would Christ have come to die?’
The answer to this is obviously no, because we aren’t the center of the Christian faith. Christ died for our sins because it glorified the Godhead. Our salvation is the primary means by which God is glorified (though certainly not the only means), and thus our salvation is important, but any attempt to make the means into the purpose is a mistake.
We serve a God that is beyond our understanding. A being of infinite knowledge, majesty, power, and presence, and in glorifying him our purpose is served. We should be obsessed with Christ, because he is both God and King. He is our savior and our hope. We should be obsessed with the cross because it was the means by which our salvation came, and that is important.
However, in these obsessions we must never forget that our highest obsession, our highest purpose, is to glorify the Lord of Hosts, and only in doing is our purpose served.