It goes back to the garden. Some of the lies we inherited, which has stripped us of experiencing the power of Elohim to the measure He would desire for us, is the day of worship.  It was moved back in the days of Constantine around 325 AD from Saturday, the seventh day, to Sunday, the first day; holidays have replaced HOLY days, eating animals not designed for food but that were designed to clean the earth and oceans, replaced eating only that which was designed for food in Leviticus 11; the list could go on and on.