The U.S. constitution is about the structure of the government and the things it can and cannot do. It's a remarkably short and readable document for what it is and when it was first written. And while it has been amended very slowly, it has been amended all the way up until today.

It seems you have an issue with just one part of it, the bill of rights. Besides property---which doesn't just mean land---that part addresses such other "outdated" concepts as speech, assembly, religion, rights of the individual in criminal investigations and trials, and a number of others. What connects all these ideas together is that they are the rights the people have _against_ government action. Things the government should not do to harm people.

That purpose is really important. The constitution is not, and should not be, a list of good policies or social values. Most of it is a list of specific things the government did in the past---some of them truly heinous things---that it is not allowed to do anymore. There's only one notable exception: the 18th amendment, meant to enforce the social values of the time and which was, ya know, repealed later for being a disaster.