You have so little faith!

This may also be translated as: “You have so little faith in me!” or “You do not trust me very much!”

Why did you not trust me to keep you safe?

Jesus uses a question to tell Peter that he should not have doubted. You can make explicit what Peter should not have doubted. Alternate translation: “you should not have doubted that I could keep you from sinking!” (See: rc://en/ta/man/translate/figs-rquestion, rc://en/ta/man/translate/figs-explicit)