Thirsting Souls Bible Teaching

(Rom 10:10) “For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation. (11)  For the scripture saith, Whosoever believeth on him shall not be ashamed.”  How is it possible that one could be ashamed of He Who died for their sin so that they might go to heaven and not hell? Such a person claiming to be saved must have a head belief rather than a heart faith.