Why are there so many bloody verses in the Jewish book and do I have to accept it as a Christian?

I grew up in an atheist family and these days I am researching religions. They said that I have to accept the old testament, which is the most plausible Christianity, but I do not want to accept the supremacy of the Jews and accept those terrible bloody verses.

Why are there so many bloody verses in the Jewish book and do I have to accept it as a Christian?
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