The Bible rarely tells you specifically what to do. Most of it is more of a history of the Jewish people, writing down things that happened inside of a religious context.

After all, the book of Numbers is almost entirely just a genealogical list ( namat begat numat, etc ) so unless you guys want me to give birth to 15 generations of human beings it's practically impossible to follow as an instruction.

I mean yeah sure, if you blindly copy things that people were reputed to have historically done in a modern context then you are likely to get into some kind of trouble for that.

Maybe only a few odd stares from your neighbors as you put lambs blood on your door or burn only extra virgin olive oil at the stone altar made of stones that were never worked by human tools in your back yard.

And there's nothing illegal about lusting over big old penises or preaching in Galilee, but many people would find it at best difficult to tell dead people to rise and walk or to fast for 40 days and nights in the desert.