Why the God of Abraham?

Today, of the 7 billion people on Earth, the God of Abraham is the God worshiped by 54% of them, or 3.8 billion. Of the 3,000 plus supreme deities that humans have asserted as the creator and one true God, what do you think led to this one deity becoming so popular? Abraham, one man, through Isaac and Ishmael, is said to have fathered the religions now practiced by over half the people of Earth. It seems strange, given the relative size of the tribes spawned by Isaac through Jacob/Israel, and Ishmael. How did these few wandering peoples, who lived nearly 4,000 years ago (according to the Begats), end up influencing the theology of so many humans living today?