I don't know. When you google it, what facts are returned?

First: I'd like to point out that the religion of Catholics is - by definition - "Christianity". "Christianity" is the religion. Catholicism is merely one denomination of the religion of Christianity. *** Second: I am NOT an expert on the history of Catholic teaching. In fact: I'm not even Catholic. HOWEVER: I HAVE read the entire "Catechism of the Catholic Church", and I DID attend Catholic high school (which included a two-semester course on "The History of the Church", which course I passed with As). *** That being said: as far as I know "the Jews killed Jesus" has NEVER been an OFFICIAL teaching of the Roman Catholic Church. Of course, that doesn't mean that no individual Catholic priest took it upon himself to preach such a message. Probably several have done so throughout history. But - obviously - there's a difference between 10 or 100 or even 1,000 officials (out of literally thousands upon thousands) who opine "X" when THE official teaching does not say "X" at all. *** I'd like to point out that during the Spanish Inquisition - historically the most notorious and long-lived violent suppression of alternate religious beliefs by Catholics - Jews were tolerated. Yes, laws were very strict (read: oppressive) for Jewish people living under the Inquisition, but it was the Muslims (early on) and the Protestants (later on) that were the primary targets of the Inquisition.

You can read all about it in the NT. It makes it quite clear who was responsible for the death of Jesus. Here is a link to a pretty decent article about that issue. https://theimaginativeconservative.org/2017/08/catholic-church-jews-true-story-filip-mazurczak.html

You suggesting the Bible was written after WWII? That's pretty easily disproven.

unfortunately this created a lot of antisemitism

Jesus voluntarily gave up his life to atone for everybody's sins,

Are you asking a question or making a statement?

Antisemitism has existed for hundreds of years. That's why the Jews never had a country of their own and it's why they were hated in every country they lived in. Israel was not established as "the homeland of the Jews" like the world has been buffaloed into believing - it was created as a political state. That's why it's so important that people learn the difference between Zionism and Judaism. Zionism is a political movement while Judaism is a religious/ethnic concept. Antisemitism that has been directed at the Jews (Judaism) has always been misdirected. The problems caused in the many countries through the centuries, supposedly by the "Jews", were almost always done by Zionism since they would have been political acts of some kind. Today's political Zionism was established around 1895. Before that, they were simply known as "Jews" and this is where the misconception started. They were still political, and the religious/ethnic concept of Judaism was still a distinctly separate entity but because Zionism hadn't formally declared its own separate identity, the ramifications of their actions spilled out among the entire Jewish population, leaving the religious Jews to feel the worst end of it. But Zionists, in an attempt to protect themselves, deflect the blame to all Jews and then go "rushing to their aid" to justify their own existence. It's similar to a fireman who commits arson to ensure he will always have a job. Palestine (what would later become Israel) came into the hands of the Zionists in 1917 after they maneuvered Britain into a losing position in WW1, then offered to pull the US into the war on their side to help them win. The payment for this was Palestine in the form of the Balfour Declaration. This doesn't make Israel "legal" - it's still the product of a breach of contract on Britain's part 2 years before it was handed over to the Zionists. Based on the tenants of contractual law, Palestine belongs to the Arabs (Palestinians).