(Be sure to pause my music playlist on the right sidebar before listening to this video.)
Some of the reasons why,
"As you come to Him, a living stone, rejected by men but in the sight of God chosen and precious, you yourselves are being built up as a spiritual house, to be a holy priesthood, to offer spiritual sacrifices acceptable to God through Jesus Christ." ~~1 Peter 2:4,5
Still, a mystery of mercy to me.