Well if you go by the sentiments of some of the authors of the document, they’d likely be appalled we’re still using it. Jefferson wanted it to expire every 19? 20? years so that the country wasn’t governed by the sentiments of long dead men
The "founding fathers" had a diverse set of beliefs, you can pick and choose to support a variety of diametrically opposed points of view.
Consider for instance John Jay, who thought that Christian rulers guided by Christian principles were necessary to maintain order and freedom, and thought the Republic would be doomed if it ever forgot this. A far cry from Jefferson's deism.
They did have varied beliefs especially between New England and the southern colonies, but I am referencing Jefferson here as he was one of the main authors of the constitution and not just a signatory
