Paul is very clear concerning this question. He breaks humanity into only Two Groups and demonstrates that only one of these two groups will be in the beginning Tribulation part of the final or 12th Day of the Lord. (The beginning Wrath or Tribulation Part of the 12th Day of the Lord, the Tribulation Period and Daniels 70th Week are three different names for the same event.)
1 But of the times and the seasons, brethren, ye have no need that I write unto you.
2 For yourselves know perfectly that the day of the Lord so cometh as a thief in the night.
3 For when they shall say, Peace and safety; then sudden destruction cometh upon them, as travail upon a woman with child; and they shall not escape.
4 But ye, brethren, are not in darkness, that that day should overtake you as a thief.
5 Ye are all the children of light, and the children of the day: we are not of the night, nor of darkness.
6 Therefore let us not sleep, as do others; but let us watch and be sober.
7 For they that sleep sleep in the night; and they that be drunken are drunken in the night.
8 But let us, who are of the day, be sober, putting...