I hope you guys don't mind me jumping in here, but...
The only way I can comprehend this logically, (and I could be wrong, but here it goes anyway)...
Is that, the beginning of our God, (Christ/YHWH) "lowering" or limiting and humbling himself all the way down to the point of death, before and to this God (and for this God, and for us also):
There is "one", (a God) that could predict and know everything from beginning to end...?
began "In the beginning" or "at the beginning" of creation...
It is the only way I can think of it logically, for all else, and all other ways, seem illogical and beyond reason, to me (but this is human logic and reason, and could be wrong also, IDK)...?
But, this is the only way, the only thing, the only conclusion that I have even been able to come to even begin to be able to "begin to comprehend" "it all", using "human logic and reason"... (That the beginning of our God's lowering and limiting and humbling himself to, and toward, the point of "death") started "In the beginning"...
I don't think this makes him any less God, but more is a God that we can comprehend and understand being mere humans... A God, "in time" with us and a part of time for us, and who is not so dissimilar from man, or who is not "so far dissociated or disconnected from man" that he is, or would be "incomprehensible" or un-understandable" to us...
But, a God that we can, and could "relate" to... He is no less of a God than God, in that, his God, his Father before him, (or the first member of the trinity, or the Father God), he is no less than him, in that they are just like one another in essence, or in character, or in personality, or in emotions and feelings, and in heart and soul, and/or in "being", as a being...
In all those ways, they are the same... The perhaps one and only one main difference is, that one is; or would be able to, "show "them" to us", while the other, could not... not by himself anyway, but, he needed "another"... that would volunteer to "lower himself" to the point of our being able to understand both him, them, (and even ourselves), in the process...
But, in all the ways that "matter" they are the same... In all the ways they want us to "see and know them as the same", they are the "same", and that should be all that matters...
God Bless!