Why do Muslims and Christians feel that it is their right or responsibility to....?

I do not know why any person of any faith feels that it is his/her right to tell another how to believe, beyond the behavior of ethical individuals. I think that some act from a sincere belief that they have the "right" answer; I think others are so heavily indoctrinated that their knee-jerk response to a question of religion is the one that their particular religion teaches. I suspect that the majority of proselytizers are simply going along with the majority with which they feel most comfortable, and don't give the "why" of the situation much thought one way or another.

In any case, I've never felt the need to respond to the teachings of those who would try to tell me how Judaism "should" be practiced. Most people who are not Jewish don't have the knowledge OR wisdom to substantiate their claims to "right-ness." Ultimately, my own study and judgement is what I rely upon to make decisions of a religious or ethical nature; no person truly knows what another deals with, no matter what their faith (or whether they have one). I believe it is entirely between the individual and God.

Christians do believe in the SAME God that the Jews believe in......and.....Christianity is a REFORM from the SAME God to supersede the MAN MADE deformation; distortion and disfigurement of REAL Judaism ......that is why the Christians feel that it is their right and responsibility to tell the Jews how they should practice REAL Judaism as Christianity defines it.....and later ACCEPT Christianity as the REAL NEW God religion for man and should ACCEPT Christianity as a religion......

Muslims do believe in the SAME for both Jews and Christians........

.....................................

That is why Christianity has no problem in the believe in the REAL OLD God religion to man ,Judaism.......and present Christianity as the REAL NEW God religion on earth.....

Islam has no problem in the believe in the REAL OLD God religion to man ,Judaism and Christianity..........and present Islam as the REAL NEW AND FINAL God religion to man on earth.....

This is two questions really so I will provide true answers. To the first part concerning Muslims I say this: Muslims who truthfully follow the Qu'ran believe Jews are not fit to live (as messed up as that believe is) and so any opinion they have of Jews is going to be very off. Now, many claiming to be Muslims do not hold to that belief and their views of Jews can differ wildly. As for Christians. I'm not entirely sure what you are referring to. If you are referring to Christians claiming that Jesus, or Yeshua, is the Messiah as foretold by prophets like Isaiah, I don't see how holding such a belief and expressing that belief to others could be considered telling Jews how to practice Judaism. It is a difference of belief. Each person can believe whatever he or she likes (though a person's belief in something does not ensure it's truthfulness or accuracy). Suppose there is a practice I believe is wrong, but someone else believes is acceptable. I can tell that person why I believe that behavior is unacceptable with what information I have. They can explain why they believe it is fine. Though I am trying to convince them of something I believe to be true, I am not preventing them from doing anything or violating their rights in any way. On the other side, the other person is free to hold an opinion different from mine and practice whatever activity it is that I don't approve of as long as doing so doesn't violate someone else's rights. Perhaps you are from a part of the world where the relationships between these groups differs from those where I am. If you could provide a few more details, that would be great.