Let me try to sort through this so I'm talking apples to apples.

My source calls himself "reptiliandude" and says he's a Naigaje. From what I can tell, that's the original basis of the myths of the Nagas. He says that there's an alliance of alien civilizations called the Consortium which has made deals with the "Deep State" of various human governments. He calls those who made this deal "Siriv" which is a pejorative that implies they're betraying humanity to a harmful alien agenda.

This Consortium has hidden bases around the world. The Kayeen are the majority shareholder in the Consortium. But other races involved including the Naigaje, the Ba'alaket and I'm sure there were others. He's sort of going against his own people to even try to help us understand what's going on but from what he says it's to wake his people up before they screw up and get God angry at them.

The Kayeen are the big-eyed tall humanoids who like to present themselves as super-enlightened beings. But if you dig around you'll find they really believe in rationalism and think God is a myth. The eventual goal of the Kayeen is a mass-takeover of human bodies to escape their own genetically damaged bodies. They've already been doing so at much a smaller scale with chosen elite bloodlines. It's easier for their takeover technology to interface with known DNA.

He claims the Naigaje actually believe in one God albeit a unitarian or deistic view and they have their own Jesus figure called Yeja.

Part of the reason that abortions have been promoted by the Deep State is to increase the pool of available Kayeen targets. One of the things he claims that Jesus did when he came here was to "disconnect" the Kayeen who were "possessing" people which is the origin of the "herd of pigs" story. Another of the things was to heal some of the hybrids of various races and humans of the genetic damage that had been caused such as the "bleeding woman" whom Jesus healed who is supposedly one such hybrid.

Part of the reason the Kayeen came to Earth originally to begin with was they needed to repair their genetics which they had been modifying. They didn't keep an "original" and so they need to repair the damage they did to themselves. The etymology of the word appears to be related to the Biblical word for Cain and the implication seems to be that these refer to the "watchers" who created the Nephilim. He says that the Kayeen used these hybrids to attack the Naigaje and other races 13,000 years ago and this resulted in a war which nearly destroyed the Earth's ecosystem. There were meteors bombarding the planet and the dead were polluting the environment. This seems correlated to the Younger Dryas events and the extinction of the megafauna and probably pertains to our Great Flood.

Anyway, I would be wary with trusting aliens that are manipulating our genetics because from what I hear they're not doing it for good reasons.