Christianity is rooted in Second Temple Judaism, but the two religions diverged in the first centuries of the Christian Era. Christianity places emphasis on correct belief (or orthodoxy), focusing on the New Covenant as mediated through Jesus Christ, as recorded in the New Testament. Judaism places emphasis on right conduct (or orthopraxy), focusing on the Mosaic Covenant, as recorded in the Torah and Talmud.
Christians believe in individual salvation from sin through repentance and receiving Jesus Christ as their God and Savior through faith (and in some Christian traditions, good works). Jews believe in individual and collective participation in an eternal dialogue with God through tradition, rituals, prayers and ethical actions. Christianity generally believes in a Triune God, one person of whom became human. Judaism emphasizes the Oneness of God and rejects the Christian concept of God in human form.