Jesus was 100% Jewish circa year zero. Observed Torah, went to and taught at synagogues, celebrated Hannukkah, ate a kosher diet, etc. But Christians don't follow Jesus's own religious practices.

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That's because, per Christian doctrine, Jesus created a new covenant with his sacrifice that fulfills and supersedes the old laws, and put a more spiritual mercy/love-driven interpretation on the previous rigid adherence aspects of Jewish laws and traditions before.

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