>>17280820KJV is probably the best version but some people find it more difficult to read. An ESV or NIV version that acknowledges the differences from the KJV might be easier to read.
You're going to be wasting your time reading the OT unless you understand the entirety of the OT is full of pictures and typologies of Jesus Christ.
IE, the levitical sacrifices pointed to how Jesus would be Crucified.
Moses hitting the stone once to get water to burst forth, and then later being condemned for hitting the stone twice to get water when he was told "to speak to it" is a picture of how Christ was struck once. Through his death and resurrection, we can receive everlasting waters of life through faith/speaking to God now. He did not die for us more than once, it's finished.
The book of numbers shows the tribes were divvied up to the N,S,E,W with the tabernacle in the center. They marched in the shape of a cross with the tabernacle in the middle. Balaam could not curse them when he saw them because it is a picture of Christ on the cross.
At passover, they put blood of a lamb (Jesus first came as a lamb) at the top, and sides of their door frames, in the shape of a cross.
Moses putting the serpent on the bronze cross, and people had to look to the serpent just to be saved from their snake bites. It's a picture of how we would look to Christ on the cross for forgiveness of our sins through faith.
I could sit here typing out examples until this thread gets deleted.
The Catholic Church is full of non-biblical theology and doctrine. Much of what they do is paganism with "Christian attire". I'm sure there's saved Christians that are Catholic, just like there's unsaved people that call themselves baptists, or prots, etc.