Who gets to define "blasphemy"? Even Muslim clerics don't agree among themselves - let alone clerics from other religions. The only way for this resolution to have any force is to have a Caliph who rules the world under Sharia, who will define for everyone what constitutes blasphemy.
A good point. Doesn't the Roman Catholic Church have a list of books that Catholics are not supposed to read? Maybe the UN will include that too.