The Story of Abraham and Isaac

As christians, it's by our baptism that we're brought into the covent. And you're made into a son or a daughter of god - God is your father. Christianity is the fruit of judaism. We've been grafted on to that tree as gentile christians. The process of salvation had begun so, so long ago. This whole bible is our story. But at the same time, it was a real blessing. He can't undo this blessing in similar way that we can't undo our baptism. Even if some one were to say, i renounce my baptism. No longer we want to be known as a son or daughter of god. I don