What did Abraham do for God?

God blessed him with a son, made him the father of many nations, and also gave material wealth.

Answer:

Abraham's blessings cannot be overestimated. God's promise (Genesis ch.17) to make him a father of many nations has been fully realized. His descendants inherited the Holy Land, as promised (Genesis ch.15). And Abraham has had a vast influence on the entire Western world, which continues to spread.