Paul uses a question to challenge the Jews there. They believe that God can raise the dead, but they do not believe that God brought Jesus back to life. This can be expressed as a statement. Alternate translation: "You should not judge it to be unbelievable that God raises the dead" Or "You should not say that it is impossible to believe that God raises the dead." (See: [[rc://en/ta/man/jit/figs-rquestion]])