. . . . . . . . . In particular, guilty by association?
For example, if someone says that he belongs to the KKK, we could reasonably label that person as a racist bigot.
Even if that KKK member were to say "Oh, Racism is just a rule of our club but I don't go along with it so I am not a bigot", you would surely look at the guy a bit sideways, don't you think?
So, surely the same goes for religious organizations.
The Jehovah's Witness Church, for example, prohibits celebrations of any anniversary, voting, being in the armed forces or receiving blood transfusions. Would we, therefore, be entitled to call all Jehovah's Witnesses anti-social, unpatriotic, draft-dodging child-murderers?
As per the case of the KKK member, it would sound incredulous for a Jehovah's Witness to say "Well, I don't go along with the anti-celebration bit". If you stand up for an organization that you are a member of you must surely stand up for that organization's fundamental policies.
If not, Then leave.
All Christian, Islam, and Judaist organizations shun homosexuals and members of opposing faiths so, surely we are entitled to label members of such organizations as being homophobic and prejudiced against minority groups.