"Jesus is Lord" was contrasted to "Caesar is Lord" so the statement . no one can say "Jesus is Lord" but by the Holy Spirit and connected "if you confess with your mouth and believe in your heart God raised him from the dead you will be saved" were part of a particular cultural context which meant if you confessed to the roman legions that Jesus is Lord when they were asserting you need to say "Caesar is Lord" under duress of the death penalty .. then this is evidence enough of your trust in God to resurrect you on the last day and your trust in him . if you have faith "like that" then you are most definitely saved . the love swelling in your heart must be incredible . of course you have confidence on the day of Judgement .. you're just like him . in this world .