Welcome Mo_mo, I, for one, welcome Muslim brothers into friendly discussions about our differing but related faiths. I doubt that Ismal would have arisen without Judaic-Christian influences.
The Trinity is a problem for Christians to understand most accept it and fumble around to find an explanation. I suspect that it is an outgrowth of the combination of wanting Jesus to be divine, the experience of the divine in people's daily lives and Greco-Roman philosophy/theological history. tied to their general pre-historic cultural ties. Most language groups that have been studied have developed two generic types of religions, one basically monotheistic and one pantheistic. But both traditions, in the majority of cases, all have some concept of a triune deity, in pantheistic ones they maintain a greater distinction than in monotheistic ones. But they all also recognize a basic unity, one entity somehow divided itself into three parts, with varying degrees of clearly independent existence.
Now in Indo-European religions, archeological and documentary evidence seems to indicate that the appropriate sacrifice for the three aspects were, for the creator aspect a bull; for the redeemer/savior aspect, a human; and for the sustainer aspect. a horse. Christianity, developing largely within the Greco-Roman culture, a product of Indo-European traditions, elevated the sacrifice to the redeemer/savior aspect to an ultimate state and found ways to justify the action, whether rightly or wrongly, and that includes the writers of the source documents as they were heavily influence by that tradition, likely unconsciously, even ancient Israel had extensive contact with Indo-European traditions.
yes he is called the Issa, the messenger of Allah, son of Mayium (mary).
