God, the Father, did not choose the Bible to bring Jesus to us, He chose Mary.
And the Bible answers the question How then shall we live.
Indeed Mary was "the vehicle" (I don't mean that with disrespect) to carry and bring the Word into this world. We must remember the following:
John 1:
In the beginning was the Word, and the Word was with God, and the Word was God. 2 The same was in the beginning with God. 3 All things were made by him; and without him was not any thing made that was made. 4 In him was life; and the life was the light of men. 5 And the light shineth in darkness; and the darkness comprehended it not.
Let us not forget Mary was carrying her Creator Who was from the beginning. She was not from the beginning but He was.