True Left

I've taken it upon myself to see how far I can get with drafting up a "Jamia" by compiling the various canonical and non-canonical texts of both Christianity and Islam and comparing them. I've decided that I would start this thread, so I can post updates. Already, I'm running into major problems:

I've looked into the Gospel of the Holy Twelve and the Gospel of Barnabas. While I haven't read through them in their entirety yet, the fact that both of them mention and praise Abrahamic prophets, as well as affirm the law of the Old Testament, doesn't bode well. In one part of the Gospel of Barnabas, Jesus asserts that dogs are better than uncircumcised men (an Abrahamic view, with a little bit of subtle anthropocentrism sprinkled on top). I was hoping that I would find at least a couple of texts that refrain from connecting back to the Old Testament, but even the texts that are praised the most on the main site and forum do this. The only text that isn't explicitly Abrahamic is the Gospel of Thomas, which doesn't really mean much since the Gospel of Thomas is a sayings gospel. It doesn't have a narrative. I'm a Gnostic myself, so it pains me to say that I now realize why the Gnostics were criticized so heavily back in the day. Every single text that I can find which is supposed to salvage Gnostic belief, connects back to the Old Testament, and thus reaffirms the Judeo-Christian narrative instead. The gnostic texts that do fit our criteria, were composed centuries after Jesus's death, and usually have complex, off-the-wall narratives that make it clear that they're deriving influence from outside of Christianity. I was particularly excited to crack open the Gospel of the Holy Twelve since I myself am vegan, only to end up disappointed when I actually read through some of it. Similar disappointment with the Gospel of Barnabas, which was supposed to connect Christianity back to Islam. (Speaking of Islam, another side note. What are we to make of the core narrative that Mohammed received his first revelation when he was visited by the angel Gabriel? Gabriel is an angel from the Old Testament, and is revered in Judaism.)

I would appreciate any input. It's just frustrating, because right now, it's basically impossible for me to argue that Jesus's original intention was to directly oppose the beliefs of the Old Testament, as well as its god. I would definitely lose that debate to any Judeo-Christian at least semi-knowledgeable when it comes to their faith.