This really isn’t new. Tons of stories stretching back to the Middle Ages of dudes joining monasteries to hide from/attempt to mask their crimes. Abrupt religious affinities have long been used by people to try and avoid consequences of their actions. A true Christian is one who would recognize that repentance involves accepting the consequences of one’s sins and finding effective ways to make amends.
I’d like to believe that Brand has had a genuine change. But as Jesus Himself teaches, it’s what comes out of a person that either defiles or purifies and that we will know a person by their “fruit” (meaning their actions). If his “Christianity” is an elaborate sympathy ploy or selfish attempt at skirting real consequences (“see, I’ve confessed! I’ve made a change in my life to be better!”) then it’s about as genuine as the gold pockmarking the White House right now.