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Calling it a "replacement" as opposed to a fulfilment is hateful towards the first Jewish Christians and their descendants. We don't say that Judaism "replaced" the Hebrew religion. There is a conflict of interpretation between Christianity and Orthodox Judaism. Much like Roman Catholic and Orthodox Catholic Christians. Who left whom? The original Jewish Christians and their descendants are still Jewish by birthright and never "replaced" their faith with "something else" when Christ came.
Which Israel? The scriptural Israel (not all of Israel are Israel)?
You've disliked or disagreed with "not all of Isreal are Israel" a lot. What is your interpretation? What do you see as the correct context of that passage?.
You've disliked or disagreed with "not all of Isreal are Israel" a lot. What is your interpretation? What do you see as the correct context of that passage?.
Where does it speak of mourning?
Hypergrace for Jews is not scriptural. There are clear passages which speak of those that are excluded from the promise (the ones that bear thorns instead of good fruit). The blindness is mentioned, yes, and it is possible with scripture that a Jew may be saved by grace posthumously by turning to Christ.
It might be the case that most people that called themselves "Jews" are saved. It depends on whether the love of God is in their heart (bearing good fruit). But scripturally there are people that will call themselves "Jews" and are not. I don't know how you could say all that call themselves "Jews" are saved when this contradicts scripture.