Is Worldwide Evangelism Necessary Before the Rapture?

Matthew 24:14 says "And this gospel of the kingdom will be preached in the whole world as a testimony to all nations, and then the end will come." Hear from Bible prophecy and end-times teacher Tim Buck on what the Word says about the gospel proclamation to the world. He explains how it will happen according to God's Word (found in Revelation and other prophetic books) if the Church is raptured before the tribulation. 

“But of that day and hour no one knows, not even the angels in heaven, nor the Son, but only the Father.  Take heed, watch and pray; for you do not know when the time is. It is like a man going to a far country, who left his house and gave authority to his servants, and to each his work, and commanded the doorkeeper to watch.  Watch therefore, for you do not know when the master of the house is coming—in the evening, at midnight, at the crowing of the rooster, or in the morning— lest, coming suddenly, he find you sleeping.  And what I say to you, I say to all: Watch!” -Mark 13:32-36