The Bible is indeed a very old book. It is old fashion and out of date with what people are doing today. Yes, that we will admit because people today are a law unto themselves, they do what they want. Judges 21.25
We don’t agree with how people live because most people aren’t living according to the instructions taught in the Bible. But the Lord has left it up to every person to make their own decision as to how they will live. Thing is, in the end the bible will be the standard by which men will be judged. Rev 20.12. The lives of men will be examined to see if their deeds match what is taught in the scripture. And if that isn’t the case, those souls will be cast into hell. Rev 20.13-15.
Now a person may laugh at this, but it is the truth. The bible may be old, but it is the word of God and that word is eternal and will be here when the earth is gone. Matt 24.35. Psa 119.89.152. 1 Peter 1.22-25.
So, the best thing for anyone is to forget how old the bible is and just obey it and save your soul. Matt 7.21-27. We won’t make heaven by doing what we want. We must do what God wants.