Worship according to one's own fancy; worship imposed merely by human will, not by divine authority; supererogatory worship.(noun)
The Century Dictionary (Public Domain)
Use "will-worship" in a sentence
"I would otherwise have its ornaments subsist, unless as they are, or may be, a snare to the souls of men; and especially do I condemn those ravages which have been made by the heady fury of the people, stung into zeal against will-worship by bloody persecution."
"And therefore from the cherubim or brazen serpent, to the images of man's devising; and from the worship commanded by God, to the will-worship of men, the argument is not good."
"The full casting out and rejecting of all will-worship, and their attendant abominations, Rev. xi."