It seems that ‘my God’ is subject to jealousy as well as being the object of jealousy. A Trinitarian God is not the same as the God of the Muslims. The Christian cannot allow that a description contrary to the one revealed points to the same entity. Therefore the Jews of the Old Testament were worshiping an unrevised version of God in a faulty edition presumably the same as that taught by Joseph and Mary and the local rabbi in Nazareth.
What is one to make of this sophism?:
So Paul stood in the midst of the Areopagus and said, "Men of Athens, I observe that you are very religious in all respects. "For while I was passing through and examining the objects of your worship, I also found an altar with this inscription, 'TO AN UNKNOWN GOD.' Therefore what you worship in ignorance, this I proclaim to you."(Acts 17:22)