Nowhere in The Bible does it say anything about a Christian who God will give the explicit power of telepathic conversion. However, it does say something about The Antichrist (or at least an antichrist) coming in the light and claiming to be Jesus (or, at least in this case, a special chosen one of His). In the midst of Vince's Bible cram session early on in the film, about 3-4 scenes or so before Sheri discovers her new power, this is actually slightly eluded to when he mentions a verse saying in basic terms that not all angels and spirits that appear are there to minister in good.