Another person coming late to the discussion, but for what it's worth, I think many of those people who are just passively part of a religious group like the Catholic church are doing evil. I don't think the individuals necessarily ARE evil, but they are doing evil by perpetuating this organization.
The organization of the Catholic church draws its power from the number of adherents it claims, and the number of people who will listen to the words of its leadership. And what does it do with this power? It promotes prejudice against gays, tells people not to use condoms who then go on to contract fatal illnesses, protects priests who abuse children, opposes gay marriage, tries to stop stem cell research, etc. etc.
I have friends who want to get married and have to move away to another state, in large part because of the influence of the church. Not long ago, they wouldn't have been able to do it at all. People around the country are dead who could have been saved by stem cell research or practicing safe sex. People ARE suffering and dying even to this day because of the existence of the church.
And why does the church continue to exist and have the power to do this? Not only because of the small number of vocal figureheads that are actively pushing these agendas, but also because of the large number of people who are just passively Catholics because they were raised that way, and will continue to raise their children that way.
Even if you are not pushing these issues personally, by continuing to support this organization, you share in the responsibility.
I speak of the Catholic church because they are the largest such organization in the US, but each religious person should evaluate the views and positions of the leadership of their chosen faith and ask if they deserve your continued support.
Still want to believe in God? You don't need to be Catholic to do that. Go ahead and make your own little Christian organization (that's what the protestants did). Don't go to their churches, don't associate with them, don't donate to them, don't tell people you are Catholic. They are a corrupt, selfish, and bigoted organization. To be a member of that organization, no matter how passive you are, is to support those ideas.
A person who simply wishes to hold to their faith and do so without making themselves a part of this machine, I can accept. I wouldn't agree with them, but I would accept them. A person who passively goes along with an organization like that is partially responsible for everything that organization does.