From "Point Counter Point"
"You never see animals going through the absurd and often horrible fooleries of magic and religion. . . . Dogs do not ritually urinate in the hope of persuading heaven to do the same and send down rain. Asses do not bray a liturgy to cloudless skies. Nor do cats attempt, by abstinence from cat's meat, to wheedle the feline spirits into benevolence. Only man behaves with such gratuitous folly. It is the price he has to pay for being intelligent but not, as yet, quite intelligent enough."
Huxley has also stated that he was an agnostic:
Harold Bloom, ed. (2003). Aldous Huxley. Infobase Publishing. p. 27. ISBN 978-0-7910-7040-6. "As late as 1962 he wrote to Reid Gardner, “I remain an agnostic who aspires to be a gnostic” (Letters 935)."