"Matthew 24:23-26 NIV. "At that time if anyone says to you, 
'Look, here is the Christ!' or, 'There he is!' do not believe it. For false Christs and false prophets will appear and perform great signs and miracles to deceive even the elect—if that were possible. See, I have told you ahead of time. So, if anyone tells you, 'There he is, out in the desert,' do not go out, or 'Here he is, in the inner rooms,' do not believe it."
'Look, here is the Christ!' or, 'There he is!' do not believe it. For false Christs and false prophets will appear and perform great signs and miracles to deceive even the elect—if that were possible. See, I have told you ahead of time. So, if anyone tells you, 'There he is, out in the desert,' do not go out, or 'Here he is, in the inner rooms,' do not believe it."
Paul warns Christians concerning false apostles who preach about a
Jesus who is not the real Jesus of the Bible.
2
Corinthians 11:3 & 4 NIV. "Just as Eve was deceived by the serpent's
cunning, your minds may somehow be led astray from your sincere and
pure devotion to Christ. For if someone comes to you and preaches a
Jesus other than the Jesus we preached, or if you receive a different
spirit from the one you received, or a different gospel from the one you
accepted, you put up with it easily enough."
Who are the followers of the other Jesus really serving?
2 Corinthians 11:13-15 NIV "For such men are false apostles,
deceitful workmen, masquerading as apostles of Christ. And no wonder,
for Satan himself masquerades as an angel of light. Is it not
surprising, then, if his servants masquerade as servants of
righteousness. Their end will be what their actions deserve."
Just prior to the day of Jesus' Second Coming, there is going to
appear visibly on earth a great counterfeit Christ.
2
Thessalonians 2:3 & 4 NIV.
"Don't let any one deceive you in any
way, for that day will not come until the rebellion occurs and the man
of lawlessness is revealed, the man doomed to destruction. He will
oppose and will exalt himself over everything that is called God or is
worshipped, so that he sets himself up in God's temple, proclaiming
himself to be God."
Q: What will happen to this false Christ, and how will we recognize him?
A: 2 Thessalonians 2:8-10 NIV "And then the Lawless
One will be revealed, whom the Lord Jesus Christ will overthrow with the
breath of his mouth and destroy by the splendor of his coming. The
coming of the Lawless One will be in accordance with the work of Satan
displayed in all kinds of counterfeit miracles, signs and wonders, and
in every sort of evil that deceives those who are perishing. They perish
because they refuse to love the truth and so be saved."
Tragically, those who follow false Christs sincerely regard
themselves to be genuine believers actively doing the work of Christ.
Matthew 7:22 & 23 NAS "Many will say to Me on
that day, 'Lord, Lord, did we not prophesy in Your name, and in Your
name cast out demons, and in Your name perform many miracles?' And then I
will declare to them, 'I never knew you; depart from Me, you who
practice lawlessness.' "BibleInfo