As to Bible (OT), we all can point to examples in the OT which The Church does not follow.
The Catholic Church uses the entire Bible..
CCC# 121 The Old Testament is an indispensable part of Sacred Scripture.Its books are divinely inspired and retain a permanent value,92 for the Old Covenant has never been revoked.
#129 Christians therefore read the Old Testament in the light of Christ crucified and risen. Such typological reading discloses the inexhaustible content of the Old Testament; but it must not make us forget that the Old Testament retains its own intrinsic value as Revelation reaffirmed by our Lord himself. Besides, the New Testament has to be read in the light of the Old. Early Christian catechesis made constant use of the Old Testament. As an old saying put it, the New Testament lies hidden in the Old and the Old Testament is unveiled in the New. (*107)
107 Cf. St. Augustine, Quaest. in Hept. 2,73:PL 34,623; Cf. DV 16
Priests, ordination, passing on of authority, High priest, sacrifice, atonement, original sin, creation all come from the O.T.