Im no scholar on the moslem religion. But it seems the moslem god is not known as one who goes out of his way to show love or to seek reconciliation with man. The inherent nature of the moslem god, as defined by his actions, is very different from that of the God of Abraham.
Christs purpose is to reconcile us with God. To repair the damage started by Adam and continued by us all.
Think of it this way: God needed to fix the problem from within. He had to become man, in order to show that man, at least in a single example, could resist all sin and in the final moment take on all sin (on the cross) in a final victory over it.
Christs incarnation, when he came to establish the New Covenant in which Old Testament rules were replaced by those of the New Testament, was in the form of a lamb, symbolically speaking. And his purpose was to represent us to God the Father. So of course Christ seems more gentle to us and more toned down as you put it.
Please dont forgetit would be highly unreasonable to expect that we could understand the entirety of Gods plan, including the totality of the nature of the Trinity. But I cant understand why a person wouldnt want to know as much as possible about him.
God had to become man? This sure sounds like this God is subject to Higher Ncesseity.