Why would a god need a spaceship(or in Snoke's case a mobile command ship), follow the same sound Star Trek logic used in that movie by Kirk here with SW . Why would Snoke need an Empire of mortal soldiers and superweapons and an army of dark side enforcers/knights? A God is all powerful and able to transcend time and space, a god is unlimited power and fears nothing as he's beyond human comprehension , the Alpa and the omega. Whoever this Snoke is, is just a moral man like The Son and like Darth Sidious, nothing more, nothing less. We know through Leia that Snoke needs Ben, and that he is is using Ben Solo for his powers. Its because he's of Skywalker bloodline . Then obviously Snoke is not a wellspring of power(the Force) let alone of the Dark Side incarnate - if he was he would not be afraid of losing power as its impossible to eliminate bad and just have good, there can be light without shadow its eternal. Snoke is obviously mortal, this is shown as he's damaged and aged. He, like Sidious is using Anakin as a weapon as his ace card. He is using Ben/Kylo for his Skwalker Force power which basically all goes back to the prophecy(and throw in Mortis) . And this whole both the Light and the Dark could simply mean Snoke himself has limited Force ability for whatever reason or may not even be Force empowered as we have not seen him use the Force once. He could have many Force sensitives under his employ(he apparently has or had many apprentices and these Knights of Ren appear to be them), perhaps he uses " seers" like what Sidious wanted in "Children of the Force" to be his eyes and ears and acting out like precogs from Minority Report movie. We know Sidious surrounded himself with Sith Cultists who were knowledgeable in the Dark Side and of the Sith but were not themselves Force sensitive. The Empire appeared to have been recruiting(Stormtrooper cadet program) or kidnapping Force sensitives and placed a few in their Inquisitorius.
In Aftermath , its basically what remains of of Sidious' Sith cultists trying to find the source of the Dark Side, not a being. They're leaderless, and no Sith Lord lives that they know of(Vader and Sidious dead), so if they came across the first Dark Side being they discovered on their journey and placed him upon the Emperor's throne or Snoke placed himself there, the passage is simply essentially about Satanists looking for a new Devil king leader to align themselves with and be ruled under. Snoke is out to destroy the Jedi as it appears like the Sith did, the Jedi are his only threat and natural enemy. So whoever this Snoke is, he could be a wanna-be Sith as much as Kylo is a wannabe Vader which is also a wannabe Sith either way. He's got Kylo running around with a red lightsaber like the Sith or their minions(Ventress and Inquisitors). Snoke has some knowledge of the Empire and of Vader or he's just bluffing. But I find it hard to think that Sidious would not feel Snoke spying on him, Sidious shared power with no one, not even his Apprentices were assuredly exempt from his treacherous and greedy nature
If either Snoke or Plagueis were so powerful then they would not need an apprentice let alone more than one at the same time or through the years. The Sith like the Jedi follow the Jedi tradition which they spun off off. They needed an apprentice to eventually replace them and carry on the tradition, but the only way you gain the place of Sith Master is if the Master dies naturally or his killed or murdered by the enemy or by the hand of the apprentice. If Plagueis was so great then Sidious would not of been able to have destroyed him and claimed unlimited power and the mantle of Sith Master in the first place. Sidious killed him, unless Sidious has a bad habit like Obi Wan(Maul and Vader) of leaving his victims alive or an inability to kill(Maul, Yoda, Windu and even Luke).
There is nothing that supports Snoke or the now defunct Luceno version of the Plagueis character as being one of the same person let alone them being essentially being Dark Side "Gods" or Satan himself. Why would Sidious believe his powers came from somewhere else in another universe and yet not tie it to Plagueis whom he was sure he killed, makes 0 sense. Sidious was taught everything Plagueis knew before he killed him - which included the ability " to use the Force to influence the midi-chlorians to create life" and he was able to keep himself from dying as he was unnaturally long lived.