Certainly there are a lot of them, and it's our job to reject all the modern day prophets, except one (
from Matthew 24: 24):
24 For false messiahs and false prophets will appear and perform great signs and wonders to deceive, if possible, even the elect. 25 See, I have told you ahead of time. 26 “So if anyone tells you, ‘There he is, out in the wilderness,’ do not go out; or, ‘Here he is, in the inner rooms,’ do not believe it. 27 For as lightning that comes from the east is visible even in the west, so will be the coming of the Son of Man.
This makes it harder, and it makes rejecting all to be the lazy way out. Rejecting all is easy, just say "no". Being ready is hard but it's still our task given to us in the Bible:
42 “Therefore keep watch, because you do not know on what day your Lord will come. 43 But understand this: If the owner of the house had known at what time of night the thief was coming, he would have kept watch and would not have let his house be broken into.
So that's the choice, does one examine all or does he reject all and "let his house be broken into"?