Sunday and Easter Presumptuous Sins?

Presumptuous sins are willful sins, sins of taking to ourselves authority that is not our own, sins that take advantage of our pride. Historically, groups and individuals have taken liberties and “over-stepped their bounds” in establishing forms of worship not set out in scripture. Are we guilty of this kind of arrogance, relying on our own intellectual reasoning, instead of carefully following God’s instructions. Are the observance of Sunday and Easter presumptuous sins?