Abraham Was Alive During Same Time as Noah and Shem?

 If you take a calculator with you while reading Genesis you will discover some amazing things. Of course not all Bible scholars agree.  Some of them will point out that in Hebrew thought some generations may be skipped. For instance Jesus is called the Son of David and yet 1000 years separate them.  I have pondered this question for years and maybe some of you have too.  When you add up the years found in Genesis you will conclude that Adam was created by God about 6000 years ago.  You will also discover that Abraham was 58 years old when Noah died and Shem outlived Abraham!  So the Father of the Jews, Abraham, could have studied under two men who witnessed the Flood and also had clear memories of Nephilim and a world without rain!  And Noah’s dad was alive when Adam was!  When you ponder this and realize that human history is only thousands of years old, the HIS-STORY of mankind is very brief.  Now check out this article from a Jewish source and the book of Jasher.  Tell me what you think or if you have any evidence that the “begats”in Genesis 5 and Genesis 11 are not complete in their recording of years and fathers fathering sons.  Also please note that Abraham would have been born 1948 years after creation of Adam.  Do you think it’s a coincidence that modern-day nation of Israel was born in the year 1948?  Just more things that make you say, Hmmmmm.....?  

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This is the genealogy of Shem: Shem was one hundred years old, and begot Arphaxad two years after the flood. After he begot Arphaxad, Shem lived five hundred years, and begot sons and daughters.

Arphaxad lived thirty-five years, and begot Salah.

Salah lived thirty years great, , and begot Eber.

Eber lived thirty-four years, and begot Peleg.

Peleg lived thirty years, and begot Reu.

Reu lived thirty-two years, and begot Serug.

Serug lived thirty years, and begot Nahor.

Nahor lived twenty-nine years, and begot Terah.

Now Terah lived seventy years, and begot Abram, Nahor, and Haran. (Gen 11:10-26)

And concerning Abram we read in Jasher chapter 9.

4 Haran [Abram’s oldest brother] was forty-two years old when he begat Sarai, which was in the tenth year of the life of Abram; and in those days Abram and his mother and nurse went out from the cave, as the king and his subjects had forgotten the affair of Abram.
5 And when Abram came out from the cave, he went to Noah and his son Shem, and he remained with them to learn the instruction of the Elohim and His ways, and no man knew where Abram was, and Abram served Noah and Shem his son for a long time.
6 Abram was in Noah’s house thirty-nine years, and Abram knew Yehovah from three years old, and he went in the ways of Yehovah until the day of his death, as Noah and his son Shem had taught him; and all the sons of the earth in those days greatly transgressed against Yehovah, and they rebelled against him and they served other elohim (lawmakers and judges), and they forgot Yehovah who had created them in the earth; and the inhabitants of the earth made unto themselves, at that time, every man his elohim; elohim of wood and stone which could neither speak, hear, nor deliver, and the sons of men served them and they became their elohim.

https://weareisrael.org/2012/05/08/noah-and-abraham/