..."if you confess with your mouth that Jesus is Lord and believe in your heart that God raised Him from the dead, you will be saved" (Romans 10:9).
As for the "Second Coming" being the resurrection, Hebrews 9:27-28 puts that to rest:
"And as it is appointed for man to die once, and after that comes judgment, so Christ, having been offered once to bear the sins of many, will appear a second time, not to deal with sin but to save those who are eagerly awaiting for Him."
The "will appear" is important, because Hebrews would have been written after Christ's death and resurrection.