Absolutely.
The Bible is God's revelation of His Nature and Will.
"All the good the Saviour gave to the world was communicated through this Book."
God is that Saviour. And the Saviour is God.
Isaiah called God the Saviour.
Isa 45:15 -- Verily thou art a God that hidest thyself, O God of Israel, the Saviour.
Our Saviour said,
Jn 10:30 -- I and my Father are one.
And I believe Abraham truly believed in that Saviour as well. I have no doubt that he did doubt at times however. He was just a man. He no doubt was discouraged by the apathy of professors of religion around him. We are surrounded by the same sense of apathy today.
I'm praying that our nation will return to those values.
2 Chron 7:14 -- If my people, which are called by my name, shall humble themselves, and pray, and seek my face, and turn from their wicked ways; then will I hear from heaven, and will forgive their sin, and will heal their land.