Why was abraham an important figure in the hebrew religion? what impact did he have on the mesopotamian/near east religious practices?

1st question: Jews regard Abraham as the first Patriarch of the Jewish people. Abraham was the first person to teach the idea that there was only one god. 

2nd question: Because he presented the new idea that there was only one god (they believed in a ton of different gods.)

He was amazing I loved him so much and I hate history dang

The peasantry & None