You should be afraid to go to Hell if you don't accept Jesus Christ as your Lord and Savior.
Fear is not something to be mocked or ridiculed. For the most part, fear is a healthy emotion. Fear is the beginning of wisdom. Fear often (but not always) helps you make good choices, despite what the trolls in Frozen claimed. Our jail cells, hospital beds, and cemeteries are filled with people who weren't afraid of things they should have been afraid of.