Marcion, by all accounts, was a very early and popular Christian leader. He lived and worked hundreds of years prior to the existence of Catholicism. What, if anything, did he have to say about Jesus and/or the "Holy Ghost" being completely equal to God?

"For in him dwelleth all the fulness of the Godhead bodily." - Colossians 2:9

I'm growing increasingly suspicious that Marcion was more of a dispensationalist or "hyper-dispensationalist" who fell victim to misrepresentation by those who either did not understand him or agree with him. Do we have any surviving texts that were written by himself or his proponents? Or by any of his detractors that might put him in a light other than the official view? Please see this related question and the way the enemies of dispensationalist views characterize it as "gnosticism" etc. to see what my concern is: https://christianity.stackexchange.com/questions/19104/what-is-the-argument-against-the-position-that-only-pauls-writings-are-applicab

If the premise for Marcion's Two Principles (Dualism) is correct; how does one decipher which words in the Bible belong to the Demiurge from those of the True God? [Marcion of Sinope (Wikipedia)](https://en.wikipedia.org/wiki/Marcion_of_Sinope) Catharism later on also adopted a belief in a form of Dualism and one of their works "Book of Two Principles" outlines the apparent contradictions between the God of the Old and New Testaments; but how did they (like Marcion) discern between the words of the Demiurge from those of the True God? [Cathar Theology (Wikipedia)](https://en.wikipedia.org/wiki/Catharism#Theology)

I'm interested to discover if there is any evidence that Justin Martyr and Marcion of Sinope had any direct or indirect contact before Marcion left the Church. I suspect that they may have had indirect contact through writing because they were both influential and outspoken members of a relatively small educated Christian community around the same time – Marcion was 15 years older than Justin. Also, while Justin established himself in Rome, it is well known that Irenaeus of Gaul was heavily influenced by Justin's work and published his own writings only 15 years after Justin, so I suspect that Justin's work was widespread during his lifetime, perhaps early enough to be considered by Marcion. These suspicions, however, are weakened by the fact that I do not know when Justin became widely known or when Marcion left the church. Is there any evidence that Marcion read any of Justin's works, or that the two communicated in any way, either directly or indirectly?