Little is known about Cromwell's past. 44 years old in 2277, he was born in 2233 and traveled in his youth; he arrived in Megaton when he was in his early 20s. The church granted him permission to stay due to the blessing and high standing of his predecessor in the church, who fostered him in the ways of Atom. Eventually, Cromwell proved to be a valuable resource in protecting and aiding the town, and he became an eccentric distraction to most of the citizens of Megaton. He is married to Mother Maya, his counterpart in the church.
He is a self described prophet of the Children of Atom, and styles himself as such. He fully believes in the faith, and will advise others to bask in Atom's Glow to understand that the greatest wealth that a person has is their own. He also believes that each person is lost in their own way on their own path. As the leader of his faith, he takes no effort to become involved in the lay matters around him. Confessor Cromwell and Mother Maya treat Gob with respect and an air of reverence because of their spiritual beliefs.
He can be seen standing in the center of town, next to the bomb, praying to it in ankle-deep irradiated water. He even beseeches Atom to "shape his fragile form." He is heard preaching to his audience about the teachings of the Children of Atom, mainly on the subject of "birthing a thousand stars," relating to his (and the Children of Atom's) belief that inside every atom is an entire universe.
↑ 1.01.1Cromwell: "Who have we here? Could it be? A new addition to our humble little community? Dear child, welcome! Welcome to Megaton! I am Confessor Cromwell, prophet of Atom and father of the undying Glow. Please child, come to the Church any time. Any time at all!" (ConfessorCromwell.txt)
↑ 2.02.1The Lone Wanderer: "Confessor, have you ever traveled outside of Megaton?" Cromwell: "In my youth, I traveled quite a bit. But... that was a different life. I assume that you are seeking information and advice, yes? The only advice that I can offer is this: you will find no wealth in the Wasteland greater than that which you will find within yourself. Bask in Atom's Glow, and you will understand." (ConfessorCromwell.txt)
↑Fallout 3 Official Game Guide Game of the Year Edition p.66: "Confessor Cromwell Little is known about Cromwell's past: He arrived in his early 20s (he's now 44) and was granted permission to stay due to the blessing and high standing of his successor in the church, who fostered him in the ways of Atom. Eventually, Cromwell proved to be a valuable resource in protecting and aiding the town, and he became an eccentric distraction to most of the citizens of Megaton." (Fallout 3 Official Game Guide Game of the Year Edition Wasteland Census)
↑The Lone Wanderer: "What can you tell me about Megaton?" Cromwell: "Megaton -- Atom's sacred village. He has chosen this place for the site of his shrine and we have been called. Outsiders ask us "why did you build a town around a bomb"? To them, I say: The bomb brings the promise of Division and the gift of the Glow. The bomb is us. The bomb is Atom. And thus, we are Atom -- awaiting the day in which each of us gives birth to a trillion new lives." (ConfessorCromwell.txt)
↑The Lone Wanderer: "I could use some directions around town." Cromwell: "In each our own way, we are all lost. Where would you like to be, brother/sister?" (ConfessorCromwell.txt)
↑The Lone Wanderer: "What's the news?" Cromwell: "News? My friend, I take effort not to be involved in such worldly business. Earthly pursuits distract from Atom. Of course... now that you mentioned it, I've noticed that Moira has hired a mercenary to protect her goods -- the man never sleeps. So they say." (ConfessorCromwell.txt)
↑Fallout 3 Official Game Guide Game of the Year Edition p.74: "Gob Treated as a freakish, second-class citizen by many people in Megaton (particularly Colin Moriarty), Gob is skittish and nervous, always looking over his shoulder. He does his best to maintain a sense of humor and to be friendly with customers, but this is mostly out of his desire not to be beaten. Confessor Cromwell and Mother Maya treat Gob with respect and an air of reverence because of their spiritual beliefs." (Fallout 3 Official Game Guide Game of the Year Edition Wasteland Census)
↑Cromwell: "Behold! He is coming with the clouds! And every eye shall be blind with his glory! Every ear shall be stricken deaf to hear the thunder of his voice! Let the men, women, and children of the Earth come forth to gather and behold the power of Atom! Let those who dwell here in his favored land attend now to the words of the Prophet of Atom! Come forth and drink the waters of the Glow, for this ancient weapon of war is our salvation, it is the very symbol of Atom's glory! Let it serve as a reminder of the Division that has occurred in the past and the resplendence of the promise of our division in the times to come! Give your bodies to Atom, my friends. Release yourself to his power, feel his Glow, and be Divided. There shall be no tears, no sorrow, no suffering, for in the Division, we shall see our release from the pain and hardships of this world. Yea, your suffering shall exist no longer; it shall be washed away in Atom's Glow, burned from you in the fire of his brilliance. Each of us shall give birth to a billion stars formed from the mass of our wretched and filthy bodies. Each of us shall be mother and father to a trillion civilizations. Each of us shall know peace, shall know an end to pain, and shall know Atom in his glory. I urge you, my friends -- come, drink with me and pray... Glorious Atom, I give unto you these feeble bones. I present to your will this frail body. I beg of you to use me as your vessel, guide me to your brilliance, divide each particle and give relief to this rotten flesh. Cast the fragile form of this ephemeral body into new life in the forge of your Glow. Atom, come -- bestow your presence on your unworthy servant. We stay true, until the Day of Division -- until the dawn of your return to His humble world." (ConfessorCromwell.txt)
↑"Behold! He is coming with the clouds!" is a reference to Revelation 1:7
↑Tektus: "The first of us, my predecessor Martin and I, had come north at the behest of Atom's great prophet, Confessor Cromwell..." (Tektus' dialogue)