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.)
1Thes 5:1-10
1 But of the times and the seasons, brethren, ye have no need that I write unto …