I believe that the Rapture could occur and the majority of the world would not even know.

Imagine the following situation and see if you see how this might happen.

What if there was a planned, coordinated, simultaneous event or set of events that occurred worldwide and caused so much destruction and chaos that the sudden disappearance of millions of people would be easily overlooked or assumed to be a result of that chaos.

What if terrorists were to launch a worldwide attack on a preplanned date against the infrastructure of hundreds of large metropolitan areas around the world.   The resulting chaos, looting, killing, rioting, racial, ethnic and religious fighting would overwhelm efforts of those governments and throw so much of this world into total confusion that the disappearance of  God's "faithful" would go largely unnoticed.  Just look at the aftermath of Hurricane Katrina in New Orleans to get an idea of how people behave in times of chaos. 

The Iranian President, Ahmadinejad, has recently stated that he believes "Allah" has called for him to create the worldwide chaos necessary to usher in the "Mahdi", the Islamic messiah, who will lead the Islamic fundamentalists in a worldwide Jihad to kill all non-believers.

 http://www.cbn.com/cbnnews/world/060523a.aspx 

Jesus Christ Is coming back for His own,  are you doing all you can to tell those whom God places in your path about His Love and Salvation?  The time to do so is now before all "hell" breaks loose and you have wasted "their" opportunity.