The book of Genesis tells the story that's set farthest in the past, but the part written first is the book of Exodus. This is from Wikipedia, so please fact-check it, but "A growing number of scholars have concluded that Genesis, a book traditionally assigned primarily to the Yahwist, was originally composed separately from Exodus and Numbers, and was joined to these books later by a Priestly redactor."
They cite Römer, Thomas Christian (2006). "The Elusive Yahwist: A Short History of Research". In Dozeman, Thomas B.; Schmid, Konrad (eds.). A Farewell to the Yahwist?: The Composition of the Pentateuch in Recent European Interpretation. ISBN 978-1-58983-163-6.
I won't worry when the Christians shout "Christ has risen": that's their party chant. "Deus vult", "perfidious Jews", blood libel and "ZOG" concern me, plus the filth spewed out by various conservative denominations against LGBTQ+ people.