The Gospel of Jesus Christ is such a powerful message that it's impossible to counter. So people resort to devious ways to present a false Jesus, in order to lure believers away from the Gospel.
Like with recognizing counterfeit money or valuable paintings, there are certain hallmarks of a TRUE Jesus. If people from other religions claim they also believe in Jesus, check them out:
These are some guidelines for identifying the real Jesus. If anybody comes to you with a "message" from Jesus, TEST them, and if they fail, TEACH them, and if they refuse to be taught, PRAY for them and leave it to God to judge them.