If Jesus Christ is merely a man and not God, the apostle Paul would not have said,
Paul, an apostle – not from men nor through man, but through Jesus Christ. (Gal. 1:1)
If Jesus Christ is merely God and not a man, Paul would not have said,
For there is one God, and there is one mediator between God and men, the man Christ Jesus. (1 Tim. 2:5)
If Jesus Christ is merely an angel and not God, God the Father would not have said of Him,
Your throne, O God, is forever and ever. (Heb. 1:8)
Because only God is deserving of worship, and because Jesus is fully God along with the Father, the Father said concerning Jesus,
Let all God’s angels worship Him. (Heb. 1:6)
Because the Lord Jesus is fully God and truly man, the apostle John wrote,
…the Word was God…the Word became flesh and dwelt among us. (Jn. 1:1, 14)
Both realities are found in the angel’s words to Joseph:
Behold, the virgin shall conceive and bear a son, and they shall call his name Immanuel” (which means, God with us). (Matthew 1:23)
That Mary would “bear a son” testifies to Christ’s humanity.
That this Son would be “God with us” testifies to His deity.