Why isn't the church going to go through the Tribulation?
The Church is removed at the end of the Church age, before the Tribulation begins, because it is under Grace, not Law. The Apostle Paul made clear that Gentiles are not under Law but under Grace, and Law and Grace cannot be mixed.
Les teaches that after the Church has been taken out at the end of the Church age, before the Tribulation begins, the Church will not go into the Tribulation. He says he is sure of this, though many people disagree with him. His primary reason is that when God began to deal with the Gentiles, the Apostle Paul made clear that they are not under Law but under Grace. Les maintains that you cannot mix Law and Grace, and therefore the Church cannot go into the Tribulation.