Eh?
Why would it be disrespectful to wish anyone Eid Mubarak or Happy Hannukah, or whatever, on a Christian board? Would it be disrespectful if a Hindu posted "Happy Divali" on the people of the book board, because it's reserved for people of the book?
As for the bit about "we know the game", I think you're reading a little too much into it if you see some conspiracy behind an easter greeting.
Nevertheless if you really find this thread offensive, I expect D_V or Houda could move it to the people of the book board.
V