The Great Tribulation

And he shall confirm the covenant with many for one week: and in the midst of the week he shall cause the sacrifice and the oblation to cease, and for the overspreading of abominations he shall make it desolate, even until the consummation, and that determined shall be poured upon the desolate. (Daniel 9:27 KJV)
And at that time shall Michael stand up, the great prince which standeth for the children of thy people: and there shall be a time of trouble, such as never was since there was a nation even to that same time: and at that time thy people shall be delivered, every one that shall be found written in the book. (Daniel 12:1 KJV)
Alas! for that day is great, so that none is like it: it is even the time of Jacob's trouble; but he shall be saved out of it. (Jeremiah 30:7 KJV)
For then shall be great tribulation, such as was not since the beginning of the world to this time, no, nor ever shall be. And except those days should be shortened, there should no flesh be saved: but for the elect's sake those days shall be shortened. (Matthew 24:21-22 KJV)

The Great Tribulation are for Israel. The Church should be raptured by then. But is this good news for Christians? No. Our Lord promised that Christians always have persecutions.

Remember the word that I said unto you, The servant is not greater than his lord. If they have persecuted me, they will also persecute you; if they have kept my saying, they will keep yours also. (John 15:20 KJV)
These things I have spoken unto you, that in me ye might have peace. In the world ye shall have tribulation: but be of good cheer; I have overcome the world. (John 16:33 KJV)
For verily, when we were with you, we told you before that we should suffer tribulation; even as it came to pass, and ye know. (1 Thessalonians 3:4 KJV)
Yea, and all that will live godly in Christ Jesus shall suffer persecution. (2 Timothy 3:12 KJV)
Beloved, think it not strange concerning the fiery trial which is to try you, as though some strange thing happened unto you: but rejoice, inasmuch as ye are partakers of Christ's sufferings; that, when his glory shall be revealed, ye may be glad also with exceeding joy. (1 Peter 4:12-13 KJV)

Then the Christians said, "Well, at least it is not  the Great Tribulation." But the Great Tribulation is great toward the nation of Israel, in that many will be killed.

In the whole land, declares the LORD, two thirds shall be cut off and perish, and one third shall be left alive. (Zechariah 13:8 ESV)

As for the method of persecution, would you be happier if you are imprisoned for life, sawn asunder or beheaded in this Church age and not during the Great Tribulation?

Others suffered mocking and flogging, and even chains and imprisonment. They were stoned, they were sawn in two, they were killed with the sword. They went about in skins of sheep and goats, destitute, afflicted, mistreated - of whom the world was not worthy - wandering about in deserts and mountains, and in dens and caves of the earth. (Hebrews 11:36-38 ESV)