There are reasons to believe that the book of Hebrews was written by Apollos, the Jew from Alexandria mentioned in Acts 18:24.
There are reasons to believe that the book of Hebrews was written by Barnabas, the Levite from Cyprus mentioned in Acts 4:36, who for a time accompanied the Apostle Paul as recounted in Acts 12:25 - 15:39, at which time Paul and Barnabas "had such a sharp disagreement that they parted company".
It is certain that the Apostle Paul was not the author of Hebrews. To my endless delight, the split between Paul and Barnabas brought doom on the church, at least according to Jesus, in Matthew 12:25, "Every kingdom divided against itself will be ruined."
Before I go through verses in order, I'll point out some unfortunate uses of the verb to become. The root of the problem is in Chapter 13, Verse 8, where the author says, "Jesus Christ is the same yesterday, today, and forever." Now, notice Chapter 1, Verse 4: "...[Jesus] became..." and Chapter 2, Verse 17: "...in order that he might become a...high priest..." Now if Jesus always has been and always will be unchanging, then how can he become anything?
Next, Chapter 1, Verse 5: "...today I have become your Father". In other words, Yahweh adopted the fully human Jesus, which Paul suggests in Romans as well. I believe it was the Marcionites, devout Jesusianismists in their day, also subscribed to this view. Now I'll move on to my usual sequential survey. Here I'll cover Chapters 3 - 6.
- Verse 7: "If you hear [its] voice, do not harden your hearts." Then we atheismists are safe, right? We've never heard its voice.
- Verse 11: Yahweh "declared on oath". See also Chapter 6, Verse 13, where Yahweh "swore by itself". Now take a look at Matthew 5:34-37: "Do not swear at all...Simply let your 'yes' be 'yes' and your 'no' 'no'; anything beyond this comes from the evil one. More true than most Jesusianismists realize: Yahweh is truly the evil one.
And if God's lying spirit is too busy, God itself will just send "a powerful delusion so [people] will believe [lies]." See II Thessalonians 2:11. It's not really saying much in favor of God to claim that it cannot lie.