Bieber fever,largely dormant these past few years, has resurfaced in recent months, but the virus has mutated into a more vital strain. With his albumPurpose, released this past fall, Justin Bieber has cast off the bad-boy affect of his teens, which tended to manifest via such adolescent shenanigans as egging neighbors’ houses, reckless driving, and public urination. He’s now promoting a redemption narrative that conflates performer as repentant sinner (a conceit familiar to fans of new country) with performer as Christ figure (a staple of almost every contemporary music genre besides new country) . . .