I think the most amazing way Abraham was blessed was to have Jesus as a desendant. All the people of the world have been blessed by Jesus because through him we have salvation. It's up to us whether we except salvation or not but it's there for us. By working for God, relying on him to help me, I am blessing people through Abraham. Such as teaching a Sunday school class, talking to someone about Jesus, or visiting the sick I would be blessing people through Abraham.