@kensanata no chorals, but take a look at Max Richter's neoclassical Œuvre (e.g. his Blue Notebooks for a start), which is quite suitable for rmelacholy.
As for the real classics, Händel or Telemann should do finde, but they are more cheerful most of the time.
As for the hardened atheist heart that's fine as it is, IMHO.