There are many substantial and vital differences between Judaism and Christianity. Of course there are many similarities, because Christianity emerged from Judaism. Christianity broke from Judaism, forming a new religion, so it is confusing, however comfortable the thought might be, to believe that the two religions are essentially the same, or to see Christianity as the continuation of Judaism.
Judaism's main belief is that the people of all religions are children of God, and therefore equal before God. All people have God's love, mercy, and help. In particular, Judaism does not require that a person convert to Judaism in order to achieve salvation. The only requirement for that, as understood by Jewish people, is to be ethical. While Judaism accepts the worth of all people regardless of religion, it also allows people who are not Jewish but who voluntarily wish to join the Jewish people to do so. Arnold Jacob Wolf states in "Biblical Theology: Is it Good for the Jews?" that the Old Testament text is resiliently Jewish.
Meaning that the Jews only believe in the Old Testament. While Christians believe in both Old and New Testaments.
The Christian notion of trinitarianism (Trinity) is that God is made up of God the Father, God the Son, and God the Holy Spirit. In the book of Matthew, Jesus spoke to the disciples saying, "All authority has been given to Me in heaven and on earth. Go therefore and make disciples of all nations, baptizing them in the name of the Father and the Son and the Holy Spirit" (Matthew 28:19). These few words have been translated into a deep and sacred meaning of Christianity that God is all three combined. Pastor Kraig Renfro told me in an interview that Judaism insists on a belief of monotheism, which is the belief...