What does it take for a renaissance? A willingness to go back and take another path. That is, a willingness to go back in history and take the words, thoughts, and actions of others as applying to the present. Ad fontes was the cry of the Renaissance, and later the Reformation, which looked to the sources of civilization and religion.
The “now generation” will never have a renaissance. Those who think the present is superior or who merely ignore the past will never have a renaissance. They are too self-satisfied, self-uncritical, and self-focused.
Progressive disciplines have a problem here because they have an inherent bias toward more recent knowledge and practice, which are taken to be superior to anything prior. How can they reconsider the past which in some ways has been rejected?
A renaissance is spurred by a reconsideration of the past, which could arise because of new discoveries about the past such as recovery of lost or forgotten manuscripts, or from a crisis in the present, which leads people to reconsider another way forward. The latter is the situation of today. Many, even a majority depending on what is asked, agree that contemporary civilization is in crisis, that things are going in the wrong direction.
What can be done? We can reconsider what has been rejected. Some are doing this in regard to Christianity, and are rejecting Christianity for other religions or the religion of “none”. The question then is whether what is rejected is a certain variety of Christianity or Christianity in toto. I think it is the former because critics of Christianity are often using Christian criteria to reject Christianity.
It should not be a matter of mere rejection but of openness to other ways of thinking, with an implied critique that current ways of thinking are not adequate. But it must be aimed at something that is a major component of current thought and action. Otherwise, it will lead only to an alternate way of doing things, rather than a challenge to current ways.
For example, a major component of current thought and action is naturalism, which arose in the 19th century, especially from the influence of Thomas Huxley, and took hold in the 20th century. Those challenging the limitation of the natural sciences to naturalistic causes today are the intelligent design theorists and those working in the Goethean approach to science.
The foundation of the modern world is anchored in the rejection of geocentrism and the acceptance of a mechanistic view of the world, as modified by quantum and relativistic theories. This includes the establishment of absolute time — now modified by relativity but otherwise intact — within a 3D spatial universe. I have challenged some of this but more work needs to be done to open the door to a renaissance of civilization.