The following are some notes from a commentary on Mark, by Eugene M. Boring.
from pg. 147
“Even though the disciples had believed Jesus could do something about the storm, Jesus addresses them with severity and compassion as “miserably afraid” … Believing Jesus could work a miracle is not identical with authentic faith … belief that Jesus works miracles is inadequate, is not yet faith, which will come only in the light of crucifixion and resurrection. …”
~ I am currently not clear on this, in particular the last bit about the crucifixion and resurrection.