Yes, I know. Judaism and Christianity are not the same thing. As a Christian, I am commanded by my Lord and God to preach His Gospel to the whole world. That includes Jews. And mohammedans, and Buddhists, and Hindoos, pagans of all sorts ... even atheists.
OK, I'll give you that. But usually good human relations require that one give a little bit of consideration to the sensitivities of the other people with whom you deal (no matter what their belief system may be, or why you are dealing with them). For us Jews, attempts at the conversion of us to Christianity NEVER end well, and the culmination of the hatred over many centuries caused by our refusal to convert was the starvation, shooting and gassing of over 1/3 of the Jewish people within living memory.
Perhaps - and I say this as kindly as I can - your (and I mean that in a collective sense, not about you personally) Christian charity might include an understanding of what Jews have been through, historically speaking.
Perhaps you might also try to understand, from a theological point of view, that G-d has a covenant with the Jews. G-d, not being a human, doesn't lie, doesn't go back on His word, and certainly knows both human nature and the future perfectly. Given that, it is theologically absurd to believe that G-d has invalidated His covenant with the Jews, because He had a crystal clear view of ALL of the events of the future at the time He made His covenant - so why would He have done it, simply to "take it back" a couple millenia later? Given that a covenant is a holy contract (i.e. a CONTRACT), maybe you should consider that G-d has the right and the ability to enter into more than one contract (we mere humans do that all the time, how can we presume to limit G-d to only one?).
In short, and with respect, please leave us alone. Roughly 1900 years of bad results from your (again collectively) conversion efforts have left the Jewish people rather testy about the whole situation; we would hope that you would understand - try cracking the binding on a few history books and showing us some of that well-advertised Christian kindness by just letting us be.