God does not change in His NATURE.... this does NOT mean that He could not or did not take on human flesh.
God plays by His rules and not yours.
John 1:1 (AKJV/PCE)
(1:1) In the beginning was the Word, and the Word was with God, and the Word was God.
John 1:14 (AKJV/PCE)
(1:14) And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth.
1Tim 3:16 (AKJV/PCE)
(3:16) And without controversy great is the mystery of godliness: God was manifest in the flesh, justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory.
Matt 1:21-25 (AKJV/PCE)
(1:21) And she shall bring forth a son, and thou shalt call his name JESUS: for he shall save his people from their sins. (1:22) Now all this was done, that it might be fulfilled which was spoken of the Lord by the prophet, saying, (1:23) Behold, a virgin shall be with child, and shall bring forth a son, and they shall call his name Emmanuel, which being interpreted is, God with us. (1:24) Then Joseph being raised from sleep did as the angel of the Lord had bidden him, and took unto him his wife: (1:25) And knew her not till she had brought forth her firstborn son: and he called his name JESUS.
Nothing confusing or hard to understand there. Unbelief is the problem.