He was a “delicatessen religionist,” not a member of one faith but someone who drew from many, and credited God (not sure whether it was God or god) for being such an amazing and prolific writer. From a 2010 CNN story:
He describes himself as a “delicatessen religionist.” He’s inspired by Eastern and Western religions.
The center of his faith, though, is love. Everything—the reason he decided to write his first short story at 12; his 56-year marriage to his muse and late wife, Maggie; his friendships with everyone from Walt Disney to Alfred Hitchcock—is based on love.
Bradbury’s favorite book in the Bible is the Gospel of John, which is filled with references to love.
“At the center of religion is love,” Bradbury says from his home, which is painted dandelion yellow in honor of his favorite book, “Dandelion Wine.”
“I love you and I forgive you. I am like you and you are like me. I love all people. I love the world. I love creating. ... Everything in our life should be based on love.”