Normally, I prefer to only talk about who is truly Israel. Sometimes though you do have to talk about the imposters. So, as a follow up to some previous posts, I found a lesson by an old friend, Dr Eric Benson, linked below.
The Bible makes more sense when you correctly identify the people in it then and today. There is a whole crowd of people out there that do not seem to be fulfilling prophecy. So some have created a new path to Christ just for them. The reality is that they are not and never have been Israel. They do admit this in some of their own official writings. There are over 100 marks that describe who is and has always been physical Israel in scripture. Archeology and history back it up.
Start with the second to last link on this page.