Because the platform on which this site is built does not currently allow it. There is an upgrade that will be coming in a few months (the reason for our Back Us Up funding drive =) that will support the feature for pictures. In the meantime you can post your pics as a friends-only blog.
Tearing upthe new testament, a very nasty book is considered an act of racism. Here in the west showing the same reverence of the Koran usually dosen't get death threats, it get's us called racist bigots. One writer, Michel, Houlellebecq, got accused of inciting racial hatred for calling the Koran "A book with a single author which is, at best, a mediocre literary work". Had to go to court to defend hismelf over racial hatred charge.