"'I destroyed the Amorite before them, though he was tall as the cedars and strong as the oaks. I destroyed his fruit above and his roots below. I brought you up out of Egypt, and I led you forty years in the desert to give you the land of the Amorites.'" NIV translation
God reminds His people of what He had done for them. When they came out of Egypt, God had destroyed the Amorites and gave their land to Israel. They could have went straight in but had to wander in the wilderness for forty years because of their lack of faith. The lack of faith among Christians today is causing many to walk around in their own wilderness instead of the land of God's provision.
God reminds them that He also gave them prophets to speak to them on His behalf as well as Nazirites to be a living example of service to Him. Instead of listening or following the example, the people corrupted the Nazirites and told the prophets to be quiet.
The same type of thing is happening today as God is raising up people to tell the world of Jesus' return and to be an example of service to Him. Sadly, many of the leaders in "churches" will not share the Truth of the Word of God because they are indebted and need the money put in their offering plate to pay for their fancy building.
"'Now then, I will crush you as a cart crushes when loaded with grain.'" NIV translation
The people left God no choice but to bring on judgment. The purpose of this judgment is to cause the people to repent and turn back to the ways of God. Just as a cart can only hold so much grain before its axle breaks, God is going to overload them to get them to the point of looking to Him for help. The same is true for the churches of today that are being corrupted by money.
"'The swift will not escape, the strong will not muster their strength, and the warrior will not save his life. The archer will not stand his ground, the fleet-footed soldier will not get away, and the horseman will not save his life. Even the bravest warriors will flee naked on that day,' declares the Lord." NIV translation
When the hand of God is against a people, there is no army or leader that will stand against Him. The judgment that the prophet talks about was carried out on the nation of Israel as they were taken into exile. There was no stopping the judgment of God then and there will be no stopping the coming judgment on the false church.