This is NOT the Rapture, this event comes at the END of the 7 year Tribulation.
These scriptures simply mean mankind is not ready for his return to set up his kingdom. They will be taken by surprise:
1 Thessalonians 5:2 For yourselves know perfectly that the day of the Lord so cometh as a thief in the night.
1 Thessalonians 5:4 But ye, brethren, are not in darkness, that that day should overtake you as a thief.
2 Peter 3:10 But the day of the Lord will come as a thief in the night; in the which the heavens shall pass away with a great noise, and the elements shall melt with fervent heat, the earth also and the works that are therein shall be burned up.
Revelation 3:3 Remember therefore how thou hast received and heard, and hold fast, and repent. If therefore thou shalt not watch, I will come on thee as a thief, and thou shalt not know what hour I will come upon thee.
Revelation 16:15 Behold, I come as a thief. Blessed is he that watcheth, and keepeth his garments, lest he walk naked, and they see his shame.
The Old Testament speaks of the 2nd coming of the Messiah but did not know of the rapture, this was a mystery given to Paul. 1 Corinthians 15:51-58, 1 Thessalonians 4:13-18
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