[P-Marlowe]

They should, but if they go around pretending that this is a form of Judaism, they should expect to be vigorously contested.

Who is in charge of determining what is or is not Judaism?

Is there a central Jewish authority?

Is someone sitting on David's throne with the unquestioned authority to determine whether or not a belief is Jewish or not?

Seems to me the only real qualification for being Jewish is that you don't believe that Jesus was the Messiah. But who made up that rule?

It seems to me that you can believe that Sammy Davis Jr. was the Messiah and still be considered Jewish, but you can't believe that Jesus of Nazareth held that title.

[Bella_Bru]

A Jew is someone born to a Jewish mother or one who has undergone a halachic conversion.

Jews generally get to decide who is and who isn't a Jew. But lately it seems as though Christians want to decide that for us as well. If it makes you feel better, go for it. Just know that none of us will listen or believe you if you say you are Jewish when your momma isn't and you haven't had a proper conversion.

[malakhi]

Is there a central Jewish authority? Is someone sitting on David's throne with the unquestioned authority to determine whether or not a belief is Jewish or not?

Is there a central Christian authority? Is someone sitting on Peter's throne with the unquestioned authority to determine whether or not a belief is Christian or not?

By your logic, I'd expect to see you preparing for conversion to Catholicism.