You know that many early Christians were Jews, right?
And they were in a first century cult, very arguably an "end times" cult that turned out to be a false expectation.
Such people are not always sensible when using religious texts.
And as that religious movement develops over time, of course we can assess whether it's genuinely consistent with the earlier religious texts that it used.
Jews historically have made that assessment, and noticed that this offshoot of their religion is completely inconsistent with the Hebrew Bible.
If you say that the new offshoot religion was using texts kind of like some other Jews did at the time, you can still end up with bad results.
And that there was not a unified view of things like the meaning of different prophesies
Oh sure, maybe just like today, when you have chaos in the different Christian interpretations.
And while some of the Hebrew Bible may still be difficult to interpret today, the general message about the Torah commands and the promises made for Israel, that kind of Jewish view of future progress isn't going to fit with Christianity, and you need extreme manipulation of texts to try to pretend that it works.