Man, you really have a strict view of what a Jew is. I would recommend you read some history and explore some alternatives to ensure what you believe is firm and true. They don’t all act in concert. There are as many sects in Christianity as there are in Judaism.

Mormons, Catholics, a bajillion protestant sects and even more culty ones...

Check out the Essenes. They existed at the time of the saducees and pharasies and zealots— Ask yourself, why are these cats not mentioned in the bible?