What does Les define as Christendom?

Les explains that when he uses the term Christendom, he includes Protestantism, Catholicism, and all the cults—anything that uses the Bible as their rules of order. He notes that 90% of them are still living under a works religion: do this, do that, and then maybe God will accept you. But Paul screams that it is not of works; it is all of faith, faith plus nothing, relying on the finished work of Christ on our behalf. Les contrasts this with those who stumbled at the stumbling stone, Christ Jesus of Nazareth, because they sought it not by faith but as it were by the works of the law.