Ah...reminds of the great painting by Raphael...you know...Aristotle and Plato walking side by side surrounded by the other greats. Natural law is of course the source of all as per Plato...but it is not disconnected from the religious and the political as you seem to suggest. If you are arguing that the philosophy of Plato is not intimately linked to all Western religious and moral thought...well...you need to go back and read the great works like Timaeus. Aristotle and his focus on facts and "what is" rather than what should be...you could maybe argue his philosophy is free of politics and belief...but even that's a reach. But you ARE right that Plato is the foundation of conservative thought...but arguing that it has "absolutely nothing to do with politics or religion" is ludicrous. Plato DEFINES the very meaning of politics and religion...Natural law is the source of philosophy but Plato did not deny its direct application to politics/religion. Rather, it was the pillar upon which his views on both was built.
Of course...not sure what you're trying to convey about THIS discussion...but its an interesting side discussion if nothing else.
Let me try the reality of a timeline from history.
Wise Greeks, such as Plato, reflected/wrote some 400 years before Christ and Roman Catholicism.
Further Old Testament Judaism was restricted to the insular Jewish people of Judea, during
Classical Ancient Greece.
As such, the ideas & philosophy of Plato, Aristotle and their colleagues, was not influenced by
either religion, as one did not exist and the other was confined to a small city/state near Galilee.
Repeating, the essence of the ideas, among them principled conservatism; of these wise Greeks
was derived from the Natural Law, the benchmark for Mankind's attitudes, behaviors, impulses
and sentiments which defined Human Nature.
Given your sanctimonious pretentions, suggest you desist in calling anyone else ludicrous.