SP, you are digging a hole for yourself.
I, and I am sure many of us here, accept there are things that go on which are kept from us by people in powerful positions, and there are probably several groups of elite 'brotherhood', but conspiracy theorists like Eustace Mullins are merely the other side of the coin.
Studying the work of serious historians is great but they are human beings who promote their own opinions; you only have to look at our popular historians, such as David Starkey and Mary Beards, to see how they differ in their interpretations of events and historical figures. Never mind historians who specialise in church history, they are famous for rewriting history and elevating historical figures to sainthood - or the opposite, depending on their own agenda.
Sitting in front of a computer and reading the words of conspiracy theorists on the internet doesn't do anything except fill your head with material which is not good for mental health. Better to take it all with a pinch of salt, cautiously deal with what you actually know, limited as it may be, then think about something else.
Enki has commented on your other post, he's obviously researched the subject at least as well as you.