As for refuting Christianity, it is easy to do. I just don't like to undermine Christianity. It is rude.
I would expect receprocity.
I wrote in an earlier post in case you did not see that one that I think Jews who (Adults of Course) believe that Jesus is the Promised Messiah of Israel are the best ones to engage in dialouge with other Jews about all issues regarding Jesus, that is how it all started....
In Ancient Israel Jews who believed in Jesus were accepted in the Synagogues they were just another sect of Judiasm, in case you did not know even after the Death and Reseurection of Jesus the Apostles still had no clue how to preach the Word of Jesus to the Gentiles because they still thought of Gentiles as "Dirty Pigs"
It wasn't until the Holy Spirit came upon them they started to reach some gentiles but even then there was great controversy with other Jews regarding the following of TORAH for gentiles...
If Jesus was never taken to the Gentile world. I believe we would have Judiasm that would encompass the Messiahship of Jesus and the rest of the world would be Un-Richetous Gentiles and Pagan religions....