This study explores the profound influence of John Milton's religious background on his poetry, focusing on key themes, theological elements, and stylistic choices that reflect his deep engagement with Protestant Christianity and its broader implications. John Milton (1608-1674), a pivotal figure in English literature, was deeply shaped by his Protestant upbringing and education. Raised in a devout Puritan household, Milton's religious background provided a foundation for his exploration of theological themes and moral questions in his poetry. Central to his work is the epic masterpiece "Paradise Lost," where Milton reimagines the Biblical story of humanity's fall from grace. The poem's narrative intricately weaves together biblical motifs, theological debates, and Milton's personal reflections on sin, redemption, and divine providence. Milton's Protestant faith influenced his poetic style and form, notably his use of blank verse—a departure from traditional rhymed verse—that allowed him to convey a sense of grandeur and seriousness appropriate for epic poetry. His deep engagement with biblical narratives, such as the depiction of Satan's rebellion and Adam and Eve's disobedience, serves not only to retell these stories but also to explore complex theological ideas about free will, obedience, and the nature of evil. Furthermore, Milton's religious convictions permeate his advocacy for liberty and intellectual freedom, articulated in works like "Areopagitica," where he defends the right to free speech and the importance of individual conscience. These themes of liberty and moral agency resonate throughout his poetry, underscoring his belief in the inherent dignity and responsibility of the individual before God. The study concludes that the John Milton's poetry stands as a testament to the profound influence of his religious background. His exploration of biblical themes, theological controversies, and moral dilemmas reflects his deep engagement with Protestant Christianity and its enduring impact on Western literature and thought. Milton's legacy continues to inspire and provoke readers, offering timeless insights into faith, reason, and the human condition