To me a God of unification sounds like a man made notion. I think if a person made a religion then it would be PC, accepting of all different kinds of beliefs and comfortably aligned with how we currently live but Christianity is none of that. The main principles of Christianity are not love, unity and compassion but faith, hope and love. Although love is the most important faith is still necessary because it is necessary to believe that Jesus is the son of God and that He died on the cross for sinners (that is love). Christianity is also most definitely not about unity with non-believers:
Matthew 10:34-36 - "Do not think that I came to bring peace on the earth; I did not come to bring peace, but a sword. 35"For I came to set a man against his father, and a daughter against her mother, and a daughter-in-law against her mother-in-law; 36and a manís enemies will be the members of his household."
In this verse Jesus is speaking about the divisions that will come, even among family members, over their belief or lack of belief about Him.
If the Bible and the Koran both pass the test of authenticity then how can one claim that Jesus is the Son of God and that no one can know the Father without knowing Him while the Koran states that Jesus was just a prophet. You would have to selectively ignore most of the Bible and most of the Koran to try to make Islam and Christianity one uniform religion. What bigger truth can you get out of these differences? I'm not trying to attack you but I just think that if you take out what different religions believe in to try to get overarching themes then all you're left with is platitudes.