Abraham was indeed a man of great faith, but the story of Abraham presents a man growing and maturing in the faith. In a few instances he tried to 'help God out' through his own strength and intellect. On more than one occasion he gave his wife over to the ruler of the country he was passing through in fear of his life. He also had a son by his wife's maid thinking in his own wisdom that the promise might be fulfilled in this way.
Everyone who comes to Christ has the same calling as Abraham. The believer is called to forsake family, careers, possessions, or anything that would get in the way of his relationship with Jesus Christ. The believer must deny himself (Mark 1:16-21, Phil 3:5-8).
"Think not that I am come to send peace on earth: I came not to send peace, but a sword. For I am come to set a man at variance against his father, and the daughter against her mother, and the daughter in law against he mother in law. And a man's foes shall they be of his own household. He that loveth father or mother more than me is not worthy of me: and he that loveth son or daughter more than me is not worthy of me. And he that taketh not his cross, and followeth after me, is not worthy of me. He that findeth his life shall lose it: and he that loseth his life for my sake shall find it." Matt. 10:34-39
"And he said to another, Follow me. But he said, Lord suffer me first to go and bury my father. Jesus said unto him, Let the dead bury their dead: but go thou and preach the kingdom of God. And another said, Lord, I will follow thee; but let me first go bid them farwell, which are at home at my house. And Jesus said unto him, No man, having put his hand to the plough, and looking back, is fit for the kingdom of God." Luke 9:59-62
The day we were saved we accepted a calling we knew little about. We believed God, accepting the salvation he offered. Like Abraham we are to grow and mature in the faith.