The way I see it, if God exists, then presumably God is going to do whatever it's going to do. It's like a force of nature, except even more implacable and irresistable.
If there are any expectations, obligations or demands applicable to me personally in that, then they are coming direct from God him/her/itself, not from any 'theists' that I meet.
They and their beliefs about what I should be doing are basically irrelevant to the whole thing.
All that matters to me is what I believe (since that will presumably be what governs my actions), whether there's some supernatural reason why I should be doing something in particular, and how I can possibly know it if there is.