The bible isn’t a book dropped from heaven specifically for you. Get that idea out of mind, because it’s nuts.
The bible isn’t a book, it’s a library of books that chronicles the story of how God slowly revealed Himself to man over several millennia. In each era, God revealed more of Himself and offered Graces to man to move away from barbarism and towards righteousness.
In Abraham’s day human sacrifice to the God’s was the norm. God tested Abraham to see if he was willing, but didn’t let him actually do it and from that day forward, Israel knew that God did not desire human sacrifices. It’s no longer necessary for US to tie our sons to an altar and be prepared to kill them because God moved us beyond that barbarism (though the same motive sneaks in the back door these days via abortion in all too many cases, but that’s another thread!).
The famous “eye for an eye” verses of the OT are often touted as an example of Judeo-Christian violent ideology, but only by the ignorant. The context of that verse is actually God commanding His people to STOP the usual practice in the day of ESCALATING violence. Before that time, if your rival put out your eye, you killed him. If your rival killed your son, you killed ALL of his sons. And so on. God restrained Israel by prohibiting escalations in violence and (to use Benedict 16’s controversial sentiment) established a “first step towards a more moral concept” of justice and retribution. That morality didn’t culminate until Jesus, but the OT passages chronicle the progress made.
So understand the bible as a story of thousands of years of God slowly drawing his people towards Himself and restoring us to Grace lost in the Fall.