Vladimir "Bill" Tytla (1904-1968) was a character animator, who worked at Disney on such films as Snow White and the Seven Dwarfs, "The Brave Little Tailor", Pinnochio, Fantasia, and Dumbo. See this Tytla website by Eddie Bowers, his IMDB page, or his Wikipedia entry.
From "Vladimir Tytla -- Master Animator" by John Canemaker, Animation Journal, Fall 1994, pp. 8-9:
"He felt, however, the need to distance himself from their [his family's] restrictive Catholicism. 'Evidently because of so much religion in the home,' said animator Art Babbitt, his close friend, 'Bill became an atheist.'"