A Florida man was an invited guest in the home of a sleeping 13-year-old boy, who he brutally murdered for making a slight to his newfound faith. The convicted murderer pled insanity, but the judge wasn’t buying it and made him regret it. Corey Johnson at trial (left), Jovanni Sierra and his mom Karen Sierra Velez (right) (Credit: YouTube, Facebook) Corey Johnson, a 21-year-old Florida man, shocked the Palm Beach Garden community when he murdere…