So all of the Irish Catholics (or catholics) in Boston (for example) who vote straight Democrat are not actually members of the Roman Catholic Church? May want to inform Father Mulcahey that he doesn't really have a job and should vacate that building.
Are "born again," evangelical or fundamentalist Christians who vote straight Democrat truly committed Christians, or just CINOs - "christians" in name only?
Answer that and you've answered your question.
You can be a "member" of any sect and not be a true believer of that religion.
But it certainly serves the interests of the Democrat party and the liberal main stream media for you to continue to assert otherwise.