Crusades were multiple failed attempts to take back Jerusalem from the Muslims, not to protect Europe from Islam
Louis IX sending a letter to as-Salih Ayyub that said :
In November, Louis marched towards Cairo, and almost at the same time, the Ayyubid sultan of Egypt, as-Salih Ayyub, died. A force led by Robert of Artois and the Templars attacked the Egyptian camp at Gideila and advanced to Al Mansurah where they were defeated at the Battle of Al Mansurah, and Robert was killed. Meanwhile, Louis' main force was attacked by the Mameluk Baibars, the commander of the army and a future sultan himself. Louis was defeated as well, but he did not withdraw to Damietta for months, preferring to besiege Mansourah, which ended in starvation and death for the crusaders rather than the Muslims. In showing utter agony, a Templar knight lamented :
-Templar CAC
Around 1250 a poem bewailing the defeat of the Seventh Crusade by Austorc d'Aorlhac refers to Bafomet
the templar knights were eradicated after this
LOL. The crusades weren't just about Jerusalem and it wasn't only just one crusade. The capturing of Jerusalem was just one part of the crusades. They also fought against the moors who were Muslims in Iberian peninsula where they ruled. There were also crusades against the Mongols and pagans in the Baltic. Even before they decided to take Jerusalem - they had been fighting against Muslims all over Southern Europe (Iberia and Sicily) for decades. The only reason why they decided to take Jerusalem was because they defeated Islam in Europe. And I'd say that was also the reason why trans-Atlantic slavery and the invasion of Africa started when you look at the timeline and how it was also ordered by the Church. Events of the 17th century changed the world and gave power to Europeans.
No. The Knight Templar were never eradicated. They became part of the Roman Catholic Church.