That is a 'God marrying a God ' . Otherwise Jesus would not be 'Son' . .. and a Father , you know , needs a little help in the procreation stakes

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But we can't have ; God the Father , God the Shekinah , God the Son .... we could have 'Goddess the Mother' but that would be too 'pagan'. So they had to demote her to Mary , so the son could have a Mom , but that made other complications with God now having to be a Man as well .
Or, Maybe God had sex with a ghost ... or a 'spirit' , just like some of us down here are doing .
God bonked a ghost and made Jesus ... at least the ghost was 'Holy' .
( Many years back I studied some theology at University and I can tell you , the above is no weirder than some of the excuses .... I mean explanations ... I found there . )
I personally believe in Jesus as Savior. I want to preface my response with that about myself as well as just reassure you that I didn’t come to WF to intimidate, disrespect, proselytize, or otherwise hinder/bother people here.
The concepts/doctrines you are discussing—the Trinity, the divine nature (fully God, fully man) of Jesus Christ, and the immaculate conception—are complex and, at the risk of sounding arrogant without any arrogant intent, are spiritually discerned. This is what Scripture says, not just me saying that to sound wise or what have you.
The Bible teaches about God as three distinct Persons (function) Who are One; about how and why Mary, of the line of David, came to be with Child (John the Baptist’s birth/conception is good to read alongside!); about how Jesus is the Son of God and that He and the Father are One, and how the Holy Spirit bore witness of this face when He was baptized.
How do we understand something as amazingly other as the Trinity? Simplified, we don’t. Lol
Analogically…you could study human anatomy for a thousand years and yes, you could (and should) have a much better understanding at the end. But you still wouldn’t know
everything, and there would be all these connections and nuances that you’d have no idea about still. And in fact…people collectively have been studying human anatomy for ages and again, still so much to learn. Honestly, to me, if I
could understand and whittle Who God is into neat little boxes with bows in my human brain, that would be incredibly disappointing—really, devastating—on several levels.
Anyway, we do have much understanding that is provided in the Word…and the Holy Spirit instructsin communion, fellowship, and truth. God can teach people in any way He chooses. Visions, dreams, hearing the same song repeatedly (repetition in general), through other people (words, actions), direct “thoughts,” audible speech, through animals…God knows how to reach us. But like with anything more “experiential,” we can misunderstand, mishear, etc. The Bible is our “litmus” in many senses; if what we hear or experience does not align with Scripture,
we are wrong and must do our utmost to figure out why and correct.
Yes, I should definitely be using Scripture to support what I am saying. Sorry, I am not because I am limited on time and am woefully unprepared to cite specific verses without my Bible handy.
Again, not looking to offend here or argue with anyone. I generally actively avoid most discussions of such nature because I don’t want to have the appearance of disrespect and I understand most don’t share my beliefs or views. I’m quite fond of people on here after lurking a while as well. But it seemed like maybe I could be of some help in explaining a bit? Maybe not. Suffice to say it’s good to ask questions and keep learning no matter what you believe at present!