Get a clue - there's a whole system out there running your (and everone else's) universe...

Of all these self help books, all those self improvement tapes, all the religious dogmas, every ideologue, there is a single underlying system which explains how everything works and fits together.

Woooof. That's one heady statement to make.

But I've been working this over for over 8 years now as a steady research and collecting notes the earlier 40-some - on just about everything that crossed my path. So when I say that I've been able to boil down the universe into a single system, it just might be plausible.

The basic is back on the farm. Did you know that Nature runs the same, no matter what you believe, or practice, or what party you belong to? True. Plant a seed anywhere on this planet and as long as it has enough sunlight, enough nutrients, and is warm enough to do it's job - you'll have a sprouted plant. Keep these conditions long enough and that plant will make seeds so you can make more plants.

Heated greenhouses in Antarctica prove it.

So how do all these religions say they are the only way out and that all others are (whatever)? They are simply running marketing silos, trying to build a monopoly of belief and so finance their buildings and what-not.

That's a bit cruel, and perhaps steps on everyone's toes at once. But if you analyze organized religions against marketing data, that's what falls out.

Back up a bit.

All - and I mean all - religions and phil0sophies contain certain common points. One of these is the "Golden Rule". Every single historical belief-system we have on this planet has recognized that there is a definite reciprocity on this mud-ball we live on. What ever you do has consequences - and these all come back to haunt or elevate you. Your choice - treat people like manure and you'll get manure dumped on you. Treat people with respect and you'll get respect. Be charitable, get charity. Help others, get helped.

On and on and on.

Most nations have outlawed capital punishment - who wants to cast that first stone?

I think that if you looked hard enough, you'd also find some recognition of the Law of Attraction in all these - but it's a different search. I know it's been written about in both the New and Old Testaments. And Huna mentions it - which is the oldest-known philosophic system still practiced on this planet.

Of course, this above would then be a complete study all on its own. And I'll leave that to theologists to study up as part of the postgraduate studies. I'll keep to the broad strokes.

Let's just go with this idea that, like Nature, we are all living on this planet under the same rules. We all have bodies which are different hues and shades, but all function the same. There are only so many blood types, and they can all be fixed with varying degrees of success when they get broken.

It is just logical that all these religions, cults, and belief-systems (extremist, moderate, conservative) work because of that underlying common system, not in spite of it.

How would I go about explaining it?

1. Take Napoleon Hill's "Think and Grow Rich" as the base, and back up to Huna's 7 principles to explain how this works. 
2. Expand to his Law of Success, and widen the scope to include Haanel's Master Key System, as well as Mental Chemistry. 
3. Compare with Science of Getting Rich. 
4. Examine the phenomenon of "The Secret", which is pushing the Law of Attraction. 
5. Review Atkinson's works along this line, as well as Earl Prevette. 
6. Back this up through Genevieve Behrend to Thomas Troward. 
7. Which then brings us right back to Huna as an overall and underlying base for all modern self help. 
8. Then come forward through current religions to show their similarities and posit the point that all religions (and all belief-systems/world-views) depend on a common system of philosophy in order to work at all. 
9. Now, the base foundation for a common system could be laid, taking just the key points held in common by all above authors and Huna. 

 And this is just the beginning. Once you lay out the basic principles, personal techniques could be approached, so that anyone could improve just about anything in their lives (thought being the first point of creation, any system of thought would then enable anything to be created/achieved/acquired).

As well, an approach to world peace is possible. If all war is either economic or ideological in origin, it would be possible to show that everyone would be richer if you allowed free commerce, as well as other human freedoms.

This underlying system does exist. Interestingly, it isn't a question of proving it, but disproving it... Because it runs on faith for fuel. Faith is based on knowledge and understanding. Those that doubt only limit themselves. The best gains to be had are by thoroughly immersing oneself in the subject. You can't try out a pair of boots to see if they fit and wear well unless you put them on, first.