"However it seems to you Jim, statisticians, the polling industry and their customers all find such a sample gives an accurate indication of the views of a population."

1. Taking my VERY recent comment and blaming it on Jim, shows just how much attention you pay to what youy are reading.

2. You can only judge the accuracy of ANY poll where there is an en result (such as elections) against which the accuracy may be gauged. In this case, not only is there no such control, but the point that non believers are more likely not to bother answering than believers is not adequately addressed.

Both you and apparently the pollsters have ignored it, leaving no possible way to show that the was or was not bias caused by it.