Jeshua is part of a religion, yet Jesua is also teaching within a religion context. This, again, the religion perspective of Jesus, we could say. Jeshuas religion, in other words.
Jeshuas religion, isn't your speculation. And clearly this is an Israelite religion, however not to get sidetracked , here, because Jeshua is teaching within an extant religion.
The jews who disagreed with certain things, in other words, already had different beliefs.
Jeshua is of a certain religious context, and teaches within that context. It isn't "only Jesus", who has these beliefs.
Now, concerning bible inerrancy, added verses, so forth, comparison can be made, of what Yeshua said. This leaves a few verses questionable, and either from translation , or added verses, then these academically could be excluded. These tend to relate to the 'riddler yeshuah', sometimes encountered in the gospels.
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Something concerning John 7,
This isn't 'riddler yeshuah', it's Yeshua teaching something to certain jews, that was already a belief. Context here, is important. One might say this is an "obvious" difference, between a spiritual based religion, and a 'rite' religion, regardless of how the practice of circumcision was ascribed some sort of meaning, beyond a regional cultural practice, [egyptians, certain non jewish tribes.
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This doesn't need much explanation.