Martianism: After the Martian World War, which was part of the greater Human wars (On Mars called "The great war of the heavens"), modern terran society broke apart on Mars, leaving it in a state of warlords who at a technological leven are between the stone till iron age (even though some bigger ones also have very few leftovers from the Terran age, which is called the Dark Era of Knowledge). Among those warlords there was a man who at terran times already knew that there will be a new beginning, obsessed with strenght, revolution, genetics, human evolution, Ancient Rome, Sparta, Egypt, China... and most of all, the obsession of a new, better human race. Thus, the man made plans, he genetically rebirthed himself as many times as he needed to become it... it being perfection in human flesh, he studied man himself, his way of thinking, his dreams, his fears, but most of all... its potential. He became smarter than everyone before him, stronger than everyone before him and more radical... than everyone before him. And when the lights of of the atom blitzed the heavens, he saw a revelation, as him, on top of the throne of all, with the worlds, heavens and beyond knelling before him, now he knew what he had to do...
Mars, which was hit the hardest, thanks to being a small and weak planet, while Venus - Mercury, Earth - Moon were strong and independent systems, while the outer alliance of Jovian, Saturnian, Uranian, Neptunian and Tychenian (planet 9 in this TL is confirmed) was neutral. Mars on the other hand fell in chaos, and in this chaos, he, now declaring himself simply as "Þe First", started the reunification of Mars under his army of genetic warriors. Brining hope, stability and a strong power back to the Martians. As of right now, he's almost done with the unification wars and starts to look to the stars, where he still sees his destiny... waiting for his golden throne above the heavens....
So now th the actual ideology! Thanks to Þe First extreme interest in ancient civilization and the human mind/genetics, martianism can be described as a system where one perfect being rules over all, trying to reform humanity into a new race, brining forth it's full potential. Thanks to the strong eugenics, fanatism and the survival of the Martian people on this weak planet, martianism also evolved as a Martian supremacist idea, with the idea that the Martians proved themself to be the rightfull ruler of humanity, thus moving the capital of the then build Human empire to Mars. Destroying the cultures of old and starting strong eugenics on the non-Martian worlds. Martianism is also pretty religious. Because Þe First made himself into a (almost) immortal, super smart and strong demigod, it is thought that he is the patron god of humanity, choosen by the ancient ways of heaven and beyond to rule it, thus it is illegal to doubt his word. on a economic view martianism can be viwed as a state protected social democratic capitalist economy, with strong unions and good worker conditions, thus also the lifestyle is pretty good (as long as you always try to improve youself and not doubt Þe First). A major point of martianism is extreme xenophobia towards aliens (which haven't been found yet, but give it time), calling humanity to conquer the entire universe and the dimensions beyond and below it, (they strill try to figure out the dimension thing, they also try to found alternate universes to also conquer).
To summarize, martianism is a Marscentric, xenophobic totalitarian, genetic system where one "perfect" being is worshipped as a God-Emperor of Mankind. Where conquest and the genetic (and cultural) improvemt of the human race is always first. And they also have a worker friendly economic system with free school and healthcare. Also very environment friendly, trying to find a good balance of farming, industry and preserving nature, of course all under the guidance of...
Þe First...