Why does Judaism differ from Christianity?

The majority of core tenets found in Christianity completely go against the teachings of Judaism.

Examples of Christian tenets that Judaism doesn't accept:

• The Christian concept of salvation and grace
• The concept of original sin
• The concept of damnation
• The concept of heaven and hell
• The existence of the devil
• The Christian concept of of messiah
• The concept of the trinity
• Praying through intermediaries
• The concept of a literal child of God
• The idea that one man can atone for the sins of another

These are just some examples, there are far more differences between Judaism and Christianity.