Probably they didn’t want to congratulate believers in the religion they believe to be the greater threat.
Michelle Malkin has the details in a message from Rep. Steve King, who supplies the names:
Nine Democrats voted No — Ackerman, Clarke, DeGette, Hastings (FL), Lee, McDermott, Scott (VA), Stark and Woolsey.
Nine Democrats voted Present — Conyers, Frank (MA), Holt, Payne, Schakowsky, Schwartz, Wasserman Schultz, Welch (VT) and Yarmuth
This is interesting because of this group 17 of the 18 Ds above voted FOR a resolution honoring Ramadan (Lee missed the vote).