At that time MANY will turn away from the faith and will betray and hate each other, and many false prophets will appear and deceive many people. (Mat 24:10,11)
The Bible teaches before the rapture occurs, two things will transpire: (1) The [great] apostasy and (2) The revealing of the antichrist.
When a person is deceived they are misled by false appearance or statement. Such a person thinks things are one way when in reality they are a different way. This sort of thing will abound in the last days, especially religiously.
According to the Lord Jesus, there are "many" false prophets in our present day that will "deceive MANY people" (Mt. 24:11). Though these false prophets might claim to know and communicate God's truth, they are spreading lies.
Falsos Profetas y Falsos Maestros (Espanol -- Spanish)
In 1 Kings 13, we learn of a man of God that had some exceptional traits, yet he got deceived and, though sincere, suffered greatly as a consequence! We can learn much from his downfall.
Calvinist Harold Camping is a definite FALSE prophet, who has done GREAT harm to those who trusted his bible interpretations!
All scripture quotations, unless otherwise indicated, are taken from the HOLY BIBLE, NEW INTERNATIONAL VERSION, NIV, Copyright 1973, 1978, 1984 by International Bible Society. Used by permission of Zondervan. All rights reserved.