The tribulation believers go through now is on earth and is from satan and his pawns. The tribulation period is when God pours out HIS wrath on unbelievers! His saints are not appointed unto wrath. Jesus, the bridegroom comes for his bride, the church, in the air and we ascend. Then in heaven there is the wedding feast for the bride/bridegroom. Later HIS saints return with Him to the earth to bring an end to the tribulation.
There is only one return. When He’s in the air - He is not returning - just shouting out for His saints to welcome them home. He comes for us - in the air!
17:14 I have given them thy word; and the world hath hated them, because they are not of the world, even as I am not of the world.
17:15 I pray not that thou shouldest take them out of the world, but that thou shouldest keep them from the evil.
Will people have not been exposed to Christ and therefore are unbelievers suffer the wrath of God?