This preface introduces the goal of the book, which is to compile the works of various scholars on the fundamental differences between Christianity and Islam. The author conducted research to verify claims made in the Quran about distortions in the Bible. He found contradictions in the Bible itself, as predicted by the Quran when a message from God is tampered with. The preface encourages open-minded study of religions based on evidence rather than blind faith. It notes that Christianity's teachings were significantly shaped by Paul, who never met Jesus, contradicting what Jesus truly said.