How did anti-semitism develop in the christian world, from the early days of christianity in rome through the 18th century?

In early christianity it was a common thougt that the Jews killed Jesus christ in since they did but theology has evolved and accepted the fact that we all killed Jesus becuase of our sins.The religion was a heresy of Judaism like Islam is a heresy of christianity.However in the 18th century long after the crusades the Jews were in the minority.We see today that majority is willing to blame the minority for its problems.Since their was a large competition between church and synagogue and the Jews rougly got the bad end of the stick after the 18th century when Hitler pointed his finger at the Jews it was only a matter of time before that build up of antisemitism exploded.

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