This is the core belief of Satanists. Excerpt from church of Satan.
As Anton LaVey explained in his classic work The Satanic Bible, Man—using his brain—invented all the Gods, doing so because many of our species cannot accept or control their personal egos, feeling compelled to conjure up one or a multiplicity of characters who can act without hindrance or guilt upon whims and desires. All Gods are thus externalized forms, magnified projections of the true nature of their creators, personifying aspects of the universe or personal temperaments which many of their followers find to be troubling. Worshipping any God is thus worshipping by proxy those who invented that God. Since the Satanist understands that all Gods are fiction, instead of bending a knee in worship to—or seeking friendship or unity with—such mythical entities, he places himself at the center of his own subjective universe as his own highest value.