They were not commanded to slaughter "Christians" as Christians as such did not exist under the Old Covenant.
Jews are commanded to slaughter everyone who isn't Jewish, including Christians.
Jews consider Jesus Christ to be a heretic and Christians to be unfaithful, even by your definition and interpretation.
We have to distinguish between Jews under the Old Law and Jews under the New.
Those under the New who still identify as Jews have as part of their identity the rejection of Christ.
Under the Old Chrust had not yet come, and so formally they could not reject Him. They could still be unfaithful, but this was with respect to the Old Law and what it commanded.
Jews don't recognize the New Law. They consider it heresy.
Jews today do. Jews before Christ had no New Law to reject
I'd be willing to bet you are referring to sections of the Talmud, which is the rabbinic law, or the Oral law. This was commentary in response to Christ and the New Covenant. Prior to Christ, there were no rabbis.
This s confusion about the religion, which is a matter to study by itself, but there's also the ethnic issue that the tribes of Israel were scattered, and the tribes of Judah were taken captive. The Jews of the Old Testament no longer exist, properly. I think might disagree with me on this (and I'd be willing to change my views if provided better evidence than what I've seen), but as far as I can tell, the current occupiers of Israel are not the tribe of Judah and are basically mutts of the Jewish diaspora including the Khazarian ashkenazim. I'm tempted to say that Zionism as it stands currently is a massive larp.
I recognize that the Talmud has shaped Jewish culture, law and belief for 3,500 years, however I was basing my argument largely on the Torah.
The Talmud is no older than 5th century A.D. It's very likely that the 'oral' law on which it is based is earlier, dating from the time of Christ. The Talmudic Jews would have you think that it was a second law given to Moses on Mt. Sinai. I very much doubt this.
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