We only know about Marcion's heresy from the Church fathers who wrote against him. Justin Martyr wrote in his apology 26 that Marcion was preaching of a second God who is "supposedly" greater than the creator God. The manner in which Justin Martyr writes about Marcion shows that he may have had...
The Christian Bible is an anthology, a collection of sometimes very diverse scriptures from (four) different cultures.
As a non-christian I do not feel bound by the dogma that the Christian Bible collection is the "Word of God", just like I don't consider the anthology of the Veda's or the...