It is part of the Nicene Creed. “begotten by the Father”. It is an article of faith for us. It has been that way for over 1500 years. Odd that you question it now...
Well; you see the book that Rome compiled mentions some folks called Bereans, and how they searched the Scriptures to see if what they'd been told was true; and that modus operandi (a little Latin for the fans) has kinda rubbed off onto me.
Remember when that angel was talking to Mary, and she asked, "How shall this be...?"
I think, IIRC, that the angel said the Holy Ghost would overshadow thee...