Postmaster said:
Nope wrong... Christianity never did that with Judaism. If you compare heresy of Judaism compared to Christianity you haven't got much because it's an extension, some would argue that there isn't even any at all. However you compare heresy from Christianity to Islam, you got something really wrong..
I have to admit, as a Christ-follower, this has not been my experience. In my comparative studies of Judaism and Christianity, and talking things over with Jews, the following often are considered heretical or "wrong interpretations" by Jews:
1. Jesus as God, which is the dominant way of thinking about him in Christianity. To a Jew, God is a One Divine Entity. There can be no trinity, because God is always One and One only. Jewish people tell me that to worship Jesus is to break the first commandment.
2. Jews believe that God made all things perfect and as they should be. They say that Christians view of Satan makes God's creation of the angels imperfect, because the angels were messengers of God and had no free will according to Judaism. Thus, the Christian Satan, who has free will and fights God and is often framed as God's enemy and "winning" in some people's hearts, appears as a pseudo-deity compared to the Jewish Satan, who is the angel of temptation and death and judgment, the "adversary" and "prosecutor," an entity that is just doing his job as God commands him. Jews believe that God created both good and evil in order that we may grow spiritually, and OT scripture supports this (even the translations in English).
3. Jews do not believe in an eternal hell. They believe that those who fail to put spirituality and righteousness as a strong priority in life will spend time away from God after death in order to learn the lessons they missed. Some Jews believe reincarnation may occur to learn lessons. Hell ("Gehenna") is a metaphor for this separation from God for us to learn our lessons and attain righteousness and a spiritual connection to God.
4. Jews do not believe that the OT God is wrathful, judgmental, and unyielding. They believe their Father God is just but also merciful, and if one tries hard in life to be righteous, one will enter the Kingdom of Heaven. They did not have the idea that perfection was required, which is how many Christians view it: that Jesus is mediating between humans and the Father, who is unable to let them into heaven without the covering of Jesus.
5. Jews do not believe God is gendered. In the Torah, the Hebrew words for God alternatively are masculine, feminine, and plural. This was to show that God was not gendered. God was beyond gender and had no physical form. Some Christians believe in the non-corporeal Jewish version of God, others I know believe in the masculine, corporeal God as Father and Son.
6. Jews never had the idea that Gentiles had any obligation to follow the law. They tell me that Gentiles are judged based on cultivating spirituality and ethical action (righteousness), just as Jews are, but they are not judged under the law because that was exclusive to the Jewish people. One can convert to Judaism, but they do not believe that non-Jewish people automatically cannot enter the Kingdom of Heaven. This is one of the reasons many of them have problems with Christianity, which typically professes to be the only way for everybody in the world.
7. Jews never saw the Messiah as God. The Messiah was King. This gets back to #1.
That's just a few off the top of my head, and some Jews definitely consider central tenets of Christianity to be heretical. If Jews considered the NT to be simply an extension of the OT, as Christians do, they would likely be Christians and not Jews. The fact that they reject many teachings and/or interpretations of the NT is evidence that they do not agree that it is a simple extension.