Marcion of Sinope was a shipbuilder
Marcion of Sinope (circa 85-160 AD) was a shipbuilder. He like many Christians after him had a hard time reconciling the wrathful god of the Old Testament to the God of Jesus. His solution was audaciously simple: they weren't the same God.
To Marcion, unlike the Gnostics after him, the god of the Old Testament was not pure evil nor was his universe pure evil. The OT god was much like us in many ways, he had... emotional problems. To his credit, he did insist on justice within the Jewish community, but these alone were his people and anyone else could get screwed, pretty much. So the god of the Old Testament wasn't Satan (although Satan apparently is one of his employees according to the book of Job).
Because Marcion didn't want God to even have the taint of having created the god of Moses (Mo'god), he said that the true God of Jesus was from some completely alien dimension of sorts from this one, and that Mo'god didn't even know of the existence of the God of Jesus.
Proto-orthodox Christians called Christ "Christ", which means annointed one (king). This was in line with Jewish expectation of a messiah who would rule Israel and shake off her oppressors. Marcion said that this messiah, the one of Jewish expectation, had not come and was not Jesus. The gospels and epistles had been written in Greek which at that time did not use vowels. So Christ was "CHRST". The proto-orthodox assumed an "i" as the missing vowel, Marcion assumed an "e", so for the proto-orthodox Jesus was the "Christ", to Marcion Jesus was the "Chrest", which in Greek means "benevolent one". This is why a letter by an early Roman official calls Jesus "Chrestus" when he is complaining about his followers to the government.
Marcion was considered the arch-enemy of the proto-orthodox Christians far and above anyone else. Tertullian wrote not one but five books against him. In fact, nothing of Marcion's own work remains, but so many proto-orthodox and Orthodox (after the council of Nicea) writers wrote against him that we can reconstruct virtually his whole body of work which consists of the book Antithesis and his New Testament, which consisted of a variant of Luke and ten of Paul's epistles. Marcion's effect on the Orthodox group was in fact profound, as he was the first Christian leader to formulate a canon of accepted books (a New Testament) and a distinct theology. This pattern would later be copied by Orthodox Christianity. Marcionite churches spread across Asia Minor, being found in existence as late as 400AD.
Marcion dealt with the issue of Jesus' divinity in a bizarre way, by saying that the appearance of Jesus as a human being was only an appearance, that he was in actuality pure spirit. This led to some difficulty in explaining how pure spirit could be crucified.
Why did Marcion's version of Christianity not survive or become the dominant form? One reason was that Marcion demanded strict celebacy, so much so that those who were married could only be baptized on their death bed. Obviously they didn't breed any followers and had to recruit all they had. Marcion demanded strict morality, the one thing that his opponents couldn't complain about was his ethics. He also believed that martyrdom was not to be shirked, and that anyone who had recanted their belief in order to avoid martyrdom was not to be allowed back in the church. So you have in effect a bunch of non-breeding martyrs, not a recipe for lots of followers. It is amazing considering this that they did last until around 400 AD and are suspected of having influenced groups who would go on to be the Anabaptists and the Cathars, and also strangely enough through a circuitous route, the Baptists. Marcion's unsatisfactory explanation of the Crucifixion may also have turned off many followers.
While some lump Marcion with the Gnostics, that is not fair to Marcion. Gnostics believe in secret knowledge, while Marcion believed that the Gospel and writings of Paul, who he regarded as the apostle who knew Jesus' message the best, were sufficient. Gnostics have a byzantine cosmology to explain how the good God could have ended up with a defective Earth - Marcion split that up by saying simply that there were two deities.
I totally agree with Marcion about the god of Moses (who I abbreviate as Mo'god) not being the same as Jesus' Father, although I differ with him on how all that works out.