Indeed, we had the sentence of death within ourselves so that we would not trust in ourselves, but in God who raises the dead (2 Cor. 1:9)
We are not called simply to trust in God to deliver us from death - either the physical death we all fear or the inner death that comes to some of us. We are called to allow Him to deliver us through that death, to raise us from the dead.
Any old god can rescue. Only the true God revives.
There comes a point where there is no return, no hope, where all is lost and only bitterness, regret and anger remain. There comes a time when we see the pointlessness of our own actions, where we see that no matter what we do, we can't cut it on our own. There comes a time when we have "the sentence of death within ourselves." There comes a time not only when we are dying on the cross, but when we cry out in agony to the God who has abandoned us.
And at that moment, which is the culmination of our baptism, we die.
And we are forced to trust not in ourselves, "but in God who raises the dead".