Paul uses this question to add emphasis. Alternate translation: "Has God rejected them forever because they sinned?" (See: [[rc://en/ta/man/translate/figs-rquestion]])
"That is not possible!" or "Certainly not!" This expression strongly denies that this could happen. You may have a similar expression in your language that you could use here. See how you translated this in [Romans 9:14](../09/14.md).