Are you sure that Passover is a single "holy day"? Passover is a period that lasts for 7 (to 8) days. The first and last days of Passover are "days off"--but that is not all to Passover.
The resurrection occurred during the Passover period. The fifth day of Passover is referred to as the third of the intermediate days of Pesach (chol hamoed). All of those days are part of the Passover period the first and last days aren't Passover alone. One might do well to consider the Passover in parallel with the creation days of Genesis. The 4th day is when the light appeared.
That important events will occur during or on feast days makes sense. But throwing out the significance of major events like the resurrection or the ascension and conferring of the kingdom is in conflict with sound scripture.
Re: 1+ 3 != 5
Wouldn't the fourth day of Passover/Pesach be the day the resurrection occurred according to your statements? Didn't the cutting of the first fruits and counting of the Omer commence (and the waiving of the sheaf be done) on that day?