It is indeed a position of strength. Our faith, holistically presented, contains a cross and an empty tomb. Calvary makes our faith credible. The remission of sin is accomplished through the sacrificial shedding of blood. The resurrection makes our faith relevant.
Death is no longer victorious.
Calvary speaks to an identification with a suffering humanity. The resurrection points to the ultimate end of that suffering. Calvary legitimizes the presentation of faith to a world in need. Innocence, willingly sacrificed for needs others can't overcome, will always have an audience. The resurrection makes all of our hopes for the world eternally tangible.