This year's letter sports the Palestinian Authority's own Christmas stamps:
No irony here: In 1947, 85% of Bethlehem's population were Christian (wikipedia). That this is no longer the case is part of the tragedy of the modern Middle East.
By the way, I visited Bethlehem Bible College in 2009. It is a fine organization, doing important work in a difficult region--well worthy of your support. It is also significantly warmer than my current place of work.