Anti-Semitism (hatred of Jews) has it's roots in both classical pagan and medieval western society. Much anti-Semitism present in western society can be directly traced to erroneous Christian doctrine from the early and medieval Church. The root of anti-Semitism is "rebellion against the Lord's unchanging prophetic plan for Israel, the Church and the nations".
Our coming Messiah rules in the hearts of His covenant people in the gentle bonds of agape love. He will return to this Earth to save Israel in His glorious deliverance of Jerusalem at the Battle of Armageddon. At His Second Coming He will destroy the wicked and He will judge the nations. In the Millennium to come He will sit upon the Throne of David as the anointed Messiah/Christ, rebuilding the Temple in Jerusalem, thus re-establishing the Davidic Kingdom. He will restore this sin-sick earth and the cosmos to the harmony and beauty the Old Testament prophets saw. The people and the ecosystems will rejoice in that day. His glorious Millennial Kingdom will last one thousand years (Rev.20).
The spirit of Belial, (or rebellion), hates His coming rule with a passion. (Psalm 2) The reason is quite obvious. The return of Messiah will terminate the present gentile/heathen rulership. The current misrule of the angelic principalities and powers of this present world system will come to an end. Evil angels do their secret work. They pull the strings of depraved and lawless men. This is why the gentiles,(or nations), rage as we approach the end of this age. (Ps.2) The gentiles, (or nations), are identified in holy scripture as 'the heathen'. They are referred to by our Jewish brethren as 'the goyim'). Those among the gentiles who accept Messiah come into the covenants and the commonwealth of Israel by grace through faith. (Eph.2:12:13)
The coming Christ or Messiah is the 'Son of David'. He is "the Lion of Judah". The hostility and the raging of depraved men is directed at the Jewish Gate of Judah. So essential anti-Semitism is not "irrational" or "crazy" at all. There is a reason for it. And that reason is quite clear from our knowledge of the Holy Scriptures. This rebellious world system and its hierarchies hate and loathe the Throne of David!
Messiah/Christ will rule over the nations from this throne. He will rule in the Millennial Age to come. The dark powers fear and dread His coming rule. It is this hateful loathing of the Throne of David and the rejection of YHVH/God's coming righteous rule under Messiah that is the quintessential spiritual origin of all anti-Semitism.
The above statement was taken from "The Root of Anti-Semitism" by Gavin Finley MD. It is referenced below. This posting is designed as an excellent reference for those who would desire to explore the dark history of Satan's deception within the Body of Messiah (Christ).
You are welcomed to explore this important topic in the various articles below:
Amazon.com books on Anti-Semitism