When you consider any religious group you usually immediately go to belief systems, but what of the possibility of relationships based on attitudes rather than the belief system. Are theists aware or disturbed by this possibility?
I would think that many, especially in mainstream ideologies, would care. They might even find that as a compliment to their amicability.
-- Please see the following as a thought experiment, not attacking or judgmental of theism. --
As a Christian, I assumed that everyone I met in any church-related function was a believer. I think that is an understandable and semi-universal feeling. That back-of-the-mind assumption makes me feel comfortable. Or rather the knowledge that that may have not been true makes me feel uncomfortable. That those people I communed with may have been deceivers is crazy. Though it is no great fault of theirs that they are nonbelievers, just there for the community, it is still offputting.
And as that is a possibility, it must mean that there are people who do that. Those select people who choose to knowingly enter a religious group with no intention of conversion or learning must be interesting people. Their mindset must be one that likes the convictions that the institution instills but must disagree philosophically. How this would work out would be unlikely, however it must happen.
I would have so many questions for a person like this.
How can you like their attitudes but stop at their beliefs?
Are you almost convinced to join the faith or have you thoroughly decided against it?
Do you believe that those you commune with would be offended if you admitted your position?