What Major Religions Practice the teachings of the Old Testament?

The Old Testament is how do I put this, old. One could imagine many different people coming from many different places, times and cultures would embrace this Collection of teachings.
Update: I should have fraised this question differently.
I am looking for information on what religions read The Old Testament. It dose not matter if it is a major one practiced today or some lost faction of spitual faith from 2000 years ago.
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