1. There is no specific scripture that describes a pre-tribulation, which means that King Jesus will come back before the tribulation to rapture the Church. A great deal of Christians cannot accept the fact that the Church may go through the 7-year tribulation. They are called Pre-Tribulationalists. Mid-Tribulationalists contend that King Jesus will come to rapture the church in the middle of the tribulation. While Post-Tribulationalists are those who support that the Church may go through the tribulation and King Jesus will come back to resurrect all believers at the end of the tribulation then rapture the elect (Mat. 24:30-31).
2. Pre-tribs reason that since the church is not mentioned in the book of Revelation from chapter 3 until chapter 19 then she must have been raptured. However, the Church is not raptured but, God forbid, the anti-Christ, who is against Jesus, Jews and Christians, persecutes and gets rid of the Church. Just like Emperor Nero of the world ruling Roman Empire persecuted the first century Church, the anti-Christ of the revived Roman Empire will probably persecute the last church age. Jesus said that the servant is not above the master. If they hated and persecuted Him, they will hate us, too. Revelation chapters 1 through 3 talk about 7 churches, which are also prophetic church ages, and their persecution. It is possible that the last church age, Laodicea which is the Church of today, gets persecuted in the tribulation described by Rev. 7:9-10, 13-15 where those from every language and nation are clearly gentiles (the Church).
3. Pre-tribs maintain, “Why would God beat-up the Church in the tribulation then marry her to Jesus?” Well, King Jesus needed to overcome the devil outlined in the gospels, then King Jesus sat down at the right hand of the Father. King Jesus tells us Christians, who are following close behind Him in His foot steps, that we need to overcome the devil, then we can sit down next to King Jesus on His throne (Rev. 3:21). Christians are taught that King Jesus has fulfilled the law (it’s more like He upheld the laws and fulfilled the prophecies) so they can live however they want then get raptured, before things really get bad and without making any sacrifices for God. This is what their itching ears want to hear.
4. Remember that the resurrection of the dead in Christ Jesus (first resurrection) immediately precedes the rapture. Thus, if King Jesus raptures the Church before the tribulation, then He will have to wait 7 years for the tribulation to end then come back and perform another resurrection of believers that died in the tribulation including some of the 144,000 (another first resurrection of the dead). Finally, He would have to rapture the remnant of the 144,000 who are still alive at that time. This is scripturally absurd.
5. The rapture, anyway, is of the elect not the church. In Matthew 24:21-22, 29-31 Jesus tells His disciples that He will return for the sake of the elect. The elect are 144,000 of the 12 tribes of Israel who preach the gospel to all nations under the penalty of death. There is no where for them to run or hide from the all-knowing Beast (Rev. 13:7-10). So, the anti-Christ catches them and places them on death row. They are the last ones to work in the harvest fields (in the world saving souls) for King Jesus and are persecuted the most for Him by the anti-Christ. Therefore they are the first in Christ’s Kingdom (Mat. 20:1-16). They are righteous, virgin, Jewish males (Rev. 14:3-5). And after they have preached the gospel to the world (Mat. 24:13-14), been arrested and beat-up by the anti-Christ, King Jesus comes down from heaven, for their sake, with a loud blast of the trumpet and resurrects the dead in Him. He then raptures the remnant of the 144,000 who are beat-up and bloodied but still alive. They are transformed in a flash and we are all taken to heaven to participate in the marriage supper of the Lamb (Rev. 19:6-9).
6. Mid-Tribulationalists believe that the trumpet blast of an angel before King Jesus returns (Mat. 24:30-31) is the same as the last trumpet plague (Rev. 11:15-18) and is also the last trumpet before the rapture (1 Thes. 4:16-18). The bible does not directly say when the last trumpet plague will fall on the earth. Therefore, by using the same reasoning one can say that the last trumpet plague falls on the earth at the end (not the middle) of the tribulation. It turns out that the scriptures are more supportive of a post tribulation as noted by points 2, 3, 4, and 5.
7. It is believed that King Jesus will come back at the end of the tribulation to rapture the elect on the Feast of Trumpets. 10 days lays later, on the Day of Atonement, He will atone for the sins of Israel and they will receive Him as their Messiah (King). Then 5 days later, on the Feast of Tabernacles, He will come back to rule on earth for a thousand years (the millennium reign) after the battle at Armageddon. This is all according to the prophecies and patterns.

In writing these 7 reasons it is important to make sure that they are consistent with the whole bible to the best of my knowledge. If you have a greater understanding than what is listed, then please let me know by leaving a comment below.