Pastor Libin shares the story of his name change from Liju to Libin due to a school name transliteration issue. He emphasizes the significance of names in identity and introduced a five-week sermon series on renaming in the Old Testament, starting with Abram and Sarai becoming Abraham and Sarah. Abraham and Sarah faced 25 years of infertility and doubt but were renamed by God, symbolizing a new identity and divine promise. Their faith in God's promise led to the birth of Isaac, illustrating that God's promises are fulfilled through faith, not human effort.