You're absolutely right, in many cases including their membership.
This move gives legitimacy to the antisemetic rants of the islamofacists. Those sitting on the fence of ignorance will be easily persuaded by them that seek favor and support of their evil agenda by just pointing to this action... "See? Even your Christian leaders oppose Israel! Just like South Africa! They pull their money from the evil Jew that is oppressing the Honorable Brotherhood of Palestine!
If you get my drift...