Abraham and faith (chapter 2)

James said that Abraham was justified with his work of offering up his son Isaac on the altar.  His faith was active with works.  Active faith is completed with works.  Abraham believed in God.  He was considered righteous and thus called a friend of God.  A person is justified by works, and not by faith alone.  The works of Rahab the prostitute was justified by welcoming the Israelite messengers and sending them another way.  The body without the spirit is dead.  So too, faith without works is also dead.  What is your model for justification?