This is an enormous question. I don't know exactly what kind of answer you are looking for. When you say 21st century writers, do you mean theologians and philosophers, public intellectuals, politicians, etc.?
As for the convergence of the different approaches, skepticism, empiricism, and rationalism seem to have more points of agreement with each other than they do with fideism. If you are thinking specifically about the Thomistic version of fideism, however, it is based on rational inquiry, except within certain bounds. Indeed, Aquinas is often viewed as a progenitor of the use of reason and logic. So one might argue that more similarities exist between fideism and rationalism than the others. Hume's skepticism was based to an extent on empiricism, though ultimately he doubted the ability of observation, and thus reason, to reach correct conclusions.