If we put Jesus into a more Jewish context, including how we traditionally thought and wrote, things become probably more clearer and more logical. For one example, if anyone walked around saying or implying he was God, that would have been met with unbelievable disdain. But didn't he perform miracles, some may ask? But the belief that both good and bad people could also perform miracles can be found in both the Tanakh and "N.T.", so that really doesn't prove much of anything one way or another.
How about Jesus was "the final sacrifice for the forgiveness of sin"? Well, if we take that literally, let me ask this question: which "part" of Jesus was the actual sacrifice, his humanness or his supposed divinity? If one believes it's his humanness, then I'll have to remind them that human sacrifices were never allowed in Judaism and are certainly not ordained in Torah. If it's Jesus supposed divinity, then the question becomes how can God be sacrificed to God? Therefore, it one takes it literally, it simply doesn't add up.
So, what was being said? To me, what we see is a relatively typical Jewish approach of drawing parallels between events in symbolic fashion. Essentially, since "the Way" found itself being unwelcome at both the Temple and many or most synagogues after a while, the view could rather easily evolve to have Jesus' death be the "final sacrifice", thus no more need to offer sacrifices at the Temple. And to an extent, there is a parallel that can be established with that approach with Jesus' death and even his strongest supporters running away. IOW, his death overcomes their weakness, which is what Temple sacrifices did. See the parallel?
The Temple sacrifices were only for corporate sins, not personal ones, therefore the belief could arise that Jesus' death pretty much cleansed and authenticated this new Jewish movement-- sort of an "anointing" of sorts.
Am I certain that what I just wrote is absolutely the right way of looking at this? Of course not, largely because we can never be absolutely certain what the authors had in mind. Jews, both then and now, tend not to declare that only one interpretation must be correct. Undoubtedly each of us try our best to make sense of what we read, but I think it's extremely important to try and picture these events in the context of events and Judaism 2000 years ago and not through modern western eyes.
shalom