Sure it is, in the same way that Satanism is an offshoot of Christianity, I guess.

Perhaps that is not how it is practiced these days, but that IS how Christ intended it to be. Just read Matthew 23 in case you have any doubts. If that is not a scathing obliteration of any Rabbinic teaching that was around at the time, IDK what is.

Remember, they had the guy killed just for saying that.