Deity

Did the human author of Hebrews believe Jesus to be God? If he did, then why does he declare 'this Jesus to be God's messenger and High Priest' and not God himself?
This is an honest question, I find verses like this and don't understand them, and would be happy to hear other perspectives, even years after I post this.

"And so, dear brothers and sisters who belong to God and are partners with those called to heaven, think carefully about this Jesus whom we declare to be God's messenger and High Priest. For he was faithful to God, who appointed him, just as Moses served faithfully when he was entrusted with God's entire house.
But Jesus deserves far more glory than Moses, just as a person who builds a house deserves more praise than the house itself. For every house has a builder, but the one who built everything is God."
Hebrews 3:1-4


But then Hebrews says this earlier:

'Long ago God spoke many times and in many ways to our ancestors through the prophets. And now in these final days, he has spoken to us through his Son. God promised everything to the Son as an inheritance, and through the Son he created the universe. The Son radiates God’s own glory and expresses the very character of God, and he sustains everything by the mighty power of his command. When he had cleansed us from our sins, he sat down in the place of honor at the right hand of the majestic God in heaven. This shows that the Son is far greater than the angels, just as the name God gave him is greater than their names.
For God never said to any angel what he said to Jesus:
"You are my Son.
Today I have become your Father."
God also said,
"I will be his Father,
and he will be my Son." And when he brought his supreme Son into the world, God said,
"Let all of God’s angels worship him."
Regarding the angels, he says,
"He sends his angels like the winds,
his servants like flames of fire." But to the Son he says,
"Your throne, O God, endures forever and ever.
You rule with a scepter of justice. You love justice and hate evil.
Therefore, O God, your God has anointed you,
pouring out the oil of joy on you more than on anyone else." He also says to the Son,
"In the beginning, Lord, you laid the foundation of the earth
and made the heavens with your hands."'
Hebrews 1:1-10

I haven't seen the writer of Hebrews specifically call Jesus God yet, except in the quotations of the Prophets (which certainly doesn't count for nothing!)