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Welcome. The history of "Bible religion" is spanning a long time and that makes thing confusing.
I'll try to sum it up for you.
God creates the world, He creates Adam & Eve, the first humans, from which all humans are born
Humans rebell in various ways and lose some knowledge about God.
God reveals itself again to Abraham, head of a tribe. They form a Covenant, and Israel is born, from the tribe of Abraham.
The Israeli, having grown, begin to differentiate themselves into 12 different sub-tribes : Reuben Simeon Levi Judah Dan Naphtali Gad Asher Issachar Zebulun Joseph Benjamin
At some point, there was an internal battle between them, and they split, in one side Judah + Benjamin = the Jews (Judah, Judahism) And we lost track of the other 10: The Samaritans claims to be from the Joseph tribe.
Israel, now rougly equal to the Jews, is waiting for a Messiah
Jesus rises, claiming he is the Messiah. Some Jews acknowledge him, some other don't. Jesus is called "Jesus Christ", hence the name of his followers, the Christians. For them, everything before Jesus Christ is called "the old testament" (= respectable, wise) and everything after is the "new testament"
The Christians have internal strifes, thus splitting: Catholics, Orthodox, Protestants..
Everyone highly rever Moses, since it dates before the splits