Indeed, Christianity is the fulfillment of Judaism. That is a Catholic teaching. However, it is not even relevant to what is being discussed.
So Christianity is not a religion because God did not come to start a new religion? We know God did not come to start a new religion. I have never heard a Catholic say that or read that in Catholic literature. This is not a theological debate. It is if Christianity fits the definition of religion. It does according to the dictionary. Even if all Christians, Catholic or non Catholic AND Jews were to unanimously agree tomorrow that no Christian or Jew shall ever refer to Christianity OR Judaism as religion, it would still fit the definition of religion. No more, no less. That is all I am saying. Did The Jews only know God on a religious and not a “personal” basis?
I guess what I am saying is that I do understand what you are trying to say in a way but what you said is not really relevant to whether Christianity can be considered a religion or not, according to the real definition of religion. If you want to explain your position further, I will gladly listen. I probably will not agree

But if you think I am still not understanding you, I am open to more explanation on your part if you care to.