The early crusaders were'nt really interested in Jesus Christ per see but more about his alledged lineage, ( supposedly going right back to the Biblical King David or even further into the dynastic Kings and Queens of ancient Egypt), and their constant forays into the Holy Land were more fact finding missions rather than for conquest and booty, ( although they did seem to fill their swag bags as well from time to time
)
In time the crusaders became a more organised and larger body of Knights and eventualy became known as the
Knights Templars and in due course they started to infuriate the Roman Catholic Church by proclaiming they alone knew the secrets of J.C's life and ministry and pretty well pooh poohed much of the Roman Catholic Dogma.
Eventually the Vatican could stand the Templars antics and attitude no longer and on one fatefull knight on Friday the 13th*, ( sometime in the 13th century - exact year escapes me ), they embarked on a huge campaign of torture and murder against the Templars and their allies. However the Templars were resourcefull and many of them escaped the wrath of the Vatican army and dispersed and hid themselves around Europe , ( alledgedly taking a shit load of esorteric knowlege and artifacts with them ).
Some say the Templars eventually turned into the organisation known the world over today as the Freemasons, ( many of America's founding fathers were alledged Freemasons.......the masonic symbol of the Pyramid with the "all seeing eye" even pops up on the back of a dollar bill does'nt it
)
Anywho back to J.C, and why the Jews don't seem to have much time for him - Although there are many theories as to why, my opinion is that they knew him for what he really was - a decendant of a once powerfull royal dynasty who was acting out the Old Testament prophesy of "the coming of the messia" to reestablish his families rulership of the Jewish Nation. If true then this of course could help explain why the Roman Catholic Church has allways had such a downer on Jews.
* - if you ever wondered why Friday the 13th is allways classed as an unlucky date know you know